diff --git a/src/test/regress/expected/isolation_ref_select_for_update_vs_all_on_mx.out b/src/test/regress/expected/isolation_ref_select_for_update_vs_all_on_mx.out
new file mode 100644
index 000000000..5ea02eb65
--- /dev/null
+++ b/src/test/regress/expected/isolation_ref_select_for_update_vs_all_on_mx.out
@@ -0,0 +1,533 @@
+Parsed test spec with 3 sessions
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-select-for-update s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-select-for-update: <... completed>
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-insert s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection s3-select-count
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-insert: 
+	SELECT run_commands_on_session_level_connection_to_node('INSERT INTO ref_table VALUES (1, 10), (2, 20)');
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-insert: <... completed>
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s3-select-count: 
+	SELECT COUNT(*) FROM ref_table;
+
+count          
+
+2              
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-select s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-select: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-insert-select-ref-table s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-insert-select-ref-table: 
+	SELECT run_commands_on_session_level_connection_to_node('INSERT INTO ref_table SELECT * FROM ref_table');
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-insert-select-ref-table: <... completed>
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-copy s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection s3-select-count
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-copy: 
+	SELECT run_commands_on_session_level_connection_to_node('COPY ref_table FROM PROGRAM ''echo 1, 10 && echo 2, 20''WITH CSV');
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-copy: <... completed>
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s3-select-count: 
+	SELECT COUNT(*) FROM ref_table;
+
+count          
+
+2              
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-alter s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-alter: 
+	ALTER TABLE ref_table DROP value;
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-alter: <... completed>
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-start-session-level-connection s2-begin-on-worker s2-truncate s1-commit-worker s2-commit-worker s1-stop-connection s2-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+
+start_session_level_connection_to_node
+
+               
+step s2-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-truncate: 
+	SELECT run_commands_on_session_level_connection_to_node('TRUNCATE ref_table');
+ <waiting ...>
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-truncate: <... completed>
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-commit-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+step s2-stop-connection: 
+        SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
+
+starting permutation: s1-start-session-level-connection s1-begin-on-worker s1-select-for-update s2-coordinator-create-index-concurrently s1-commit-worker s1-stop-connection
+create_reference_table
+
+               
+step s1-start-session-level-connection: 
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+
+start_session_level_connection_to_node
+
+               
+step s1-begin-on-worker: 
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-select-for-update: 
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s2-coordinator-create-index-concurrently: 
+	CREATE INDEX CONCURRENTLY ref_table_index ON ref_table(id);
+
+step s1-commit-worker: 
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+
+run_commands_on_session_level_connection_to_node
+
+               
+step s1-stop-connection: 
+	SELECT stop_session_level_connection_to_node();
+
+stop_session_level_connection_to_node
+
+               
+restore_isolation_tester_func
+
+               
diff --git a/src/test/regress/isolation_schedule b/src/test/regress/isolation_schedule
index f5acc04c0..e810e84e5 100644
--- a/src/test/regress/isolation_schedule
+++ b/src/test/regress/isolation_schedule
@@ -68,3 +68,4 @@ test: isolation_copy_vs_all_on_mx
 test: isolation_truncate_vs_all_on_mx
 test: isolation_drop_alter_index_select_for_update_on_mx
 test: isolation_insert_select_vs_all_on_mx
+test: isolation_ref_select_for_update_vs_all_on_mx
diff --git a/src/test/regress/specs/isolation_ref_select_for_update_vs_all_on_mx.spec b/src/test/regress/specs/isolation_ref_select_for_update_vs_all_on_mx.spec
new file mode 100644
index 000000000..2d86eac43
--- /dev/null
+++ b/src/test/regress/specs/isolation_ref_select_for_update_vs_all_on_mx.spec
@@ -0,0 +1,160 @@
+# Create and use UDF to send commands from the same connection. Also make the cluster
+# ready for testing MX functionalities.
+setup
+{
+        CREATE OR REPLACE FUNCTION start_session_level_connection_to_node(text, integer)
+            RETURNS void
+            LANGUAGE C STRICT VOLATILE
+            AS 'citus', $$start_session_level_connection_to_node$$;
+
+        CREATE OR REPLACE FUNCTION run_commands_on_session_level_connection_to_node(text)
+            RETURNS void
+            LANGUAGE C STRICT VOLATILE
+            AS 'citus', $$run_commands_on_session_level_connection_to_node$$;
+
+        CREATE OR REPLACE FUNCTION stop_session_level_connection_to_node()
+            RETURNS void
+            LANGUAGE C STRICT VOLATILE
+            AS 'citus', $$stop_session_level_connection_to_node$$;
+
+        SELECT citus_internal.replace_isolation_tester_func();
+        SELECT citus_internal.refresh_isolation_tester_prepared_statement();
+
+        -- start_metadata_sync_to_node can not be run inside a transaction block
+        -- following is a workaround to overcome that
+        -- port numbers are hard coded at the moment
+        SELECT master_run_on_worker(
+                ARRAY['localhost']::text[],
+                ARRAY[57636]::int[],
+                ARRAY[format('SELECT start_metadata_sync_to_node(''%s'', %s)', nodename, nodeport)]::text[],
+                false)
+        FROM pg_dist_node;
+
+        SET citus.replication_model to streaming;
+	SET citus.shard_replication_factor TO 1;
+
+	CREATE TABLE ref_table(id integer, value integer);
+	SELECT create_reference_table('ref_table');
+}
+
+# Create and use UDF to close the connection opened in the setup step. Also return the cluster
+# back to the initial state.
+teardown
+{
+        DROP TABLE IF EXISTS ref_table CASCADE;
+        SELECT citus_internal.restore_isolation_tester_func();
+}
+
+session "s1"
+
+# We do not need to begin a transaction on coordinator, since it will be open on workers.
+
+step "s1-start-session-level-connection"
+{
+        SELECT start_session_level_connection_to_node('localhost', 57637);
+}
+
+step "s1-begin-on-worker"
+{
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+}
+
+step "s1-select-for-update"
+{
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+}
+
+step "s1-commit-worker"
+{
+	SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+}
+
+step "s1-stop-connection"
+{
+	SELECT stop_session_level_connection_to_node();
+}
+
+
+session "s2"
+
+# We do not need to begin a transaction on coordinator, since it will be open on workers.
+
+step "s2-start-session-level-connection"
+{
+        SELECT start_session_level_connection_to_node('localhost', 57638);
+}
+
+step "s2-begin-on-worker"
+{
+        SELECT run_commands_on_session_level_connection_to_node('BEGIN');
+}
+
+step "s2-insert"
+{
+	SELECT run_commands_on_session_level_connection_to_node('INSERT INTO ref_table VALUES (1, 10), (2, 20)');
+}
+
+step "s2-select"
+{
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2');
+}
+
+step "s2-insert-select-ref-table"
+{
+	SELECT run_commands_on_session_level_connection_to_node('INSERT INTO ref_table SELECT * FROM ref_table');
+}
+
+step "s2-copy"
+{
+	SELECT run_commands_on_session_level_connection_to_node('COPY ref_table FROM PROGRAM ''echo 1, 10 && echo 2, 20''WITH CSV');
+}
+
+step "s2-alter"
+{
+	ALTER TABLE ref_table DROP value;
+}
+
+step "s2-truncate"
+{
+	SELECT run_commands_on_session_level_connection_to_node('TRUNCATE ref_table');
+}
+
+step "s2-select-for-update"
+{
+	SELECT run_commands_on_session_level_connection_to_node('SELECT * FROM ref_table WHERE id=1 OR id=2 FOR UPDATE');
+}
+
+step "s2-coordinator-create-index-concurrently"
+{
+	CREATE INDEX CONCURRENTLY ref_table_index ON ref_table(id);
+}
+
+step "s2-commit-worker"
+{
+        SELECT run_commands_on_session_level_connection_to_node('COMMIT');
+}
+
+step "s2-stop-connection"
+{
+        SELECT stop_session_level_connection_to_node();
+}
+
+
+session "s3"
+
+step "s3-select-count"
+{
+	SELECT COUNT(*) FROM ref_table;
+}
+
+
+
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-select-for-update" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection"
+
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-insert" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection" "s3-select-count"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-select" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-insert-select-ref-table" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-copy" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection" "s3-select-count"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-alter" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-start-session-level-connection" "s2-begin-on-worker" "s2-truncate" "s1-commit-worker" "s2-commit-worker" "s1-stop-connection" "s2-stop-connection"
+permutation "s1-start-session-level-connection" "s1-begin-on-worker" "s1-select-for-update" "s2-coordinator-create-index-concurrently" "s1-commit-worker" "s1-stop-connection"