diff --git a/src/backend/access/transam/xact.c b/src/backend/access/transam/xact.c
index 8daaa535ed..37c5e34cce 100644
--- a/src/backend/access/transam/xact.c
+++ b/src/backend/access/transam/xact.c
@@ -3036,6 +3036,7 @@ CommitTransactionCommand(void)
 	TransactionState s = CurrentTransactionState;
 	SavedTransactionCharacteristics savetc;
 
+	/* Must save in case we need to restore below */
 	SaveTransactionCharacteristics(&savetc);
 
 	switch (s->blockState)
diff --git a/src/test/regress/expected/transactions.out b/src/test/regress/expected/transactions.out
index 7717967a9f..7f5757e89c 100644
--- a/src/test/regress/expected/transactions.out
+++ b/src/test/regress/expected/transactions.out
@@ -852,6 +852,46 @@ SHOW transaction_deferrable;
  on
 (1 row)
 
+COMMIT;
+START TRANSACTION ISOLATION LEVEL READ COMMITTED, READ WRITE, DEFERRABLE;
+SHOW transaction_isolation;
+ transaction_isolation 
+-----------------------
+ read committed
+(1 row)
+
+SHOW transaction_read_only;
+ transaction_read_only 
+-----------------------
+ off
+(1 row)
+
+SHOW transaction_deferrable;
+ transaction_deferrable 
+------------------------
+ on
+(1 row)
+
+SAVEPOINT x;
+COMMIT AND CHAIN;  -- TBLOCK_SUBCOMMIT
+SHOW transaction_isolation;
+ transaction_isolation 
+-----------------------
+ read committed
+(1 row)
+
+SHOW transaction_read_only;
+ transaction_read_only 
+-----------------------
+ off
+(1 row)
+
+SHOW transaction_deferrable;
+ transaction_deferrable 
+------------------------
+ on
+(1 row)
+
 COMMIT;
 -- different mix of options just for fun
 START TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ WRITE, NOT DEFERRABLE;
diff --git a/src/test/regress/sql/transactions.sql b/src/test/regress/sql/transactions.sql
index db2535c787..51ae1b31b3 100644
--- a/src/test/regress/sql/transactions.sql
+++ b/src/test/regress/sql/transactions.sql
@@ -489,6 +489,17 @@ SHOW transaction_read_only;
 SHOW transaction_deferrable;
 COMMIT;
 
+START TRANSACTION ISOLATION LEVEL READ COMMITTED, READ WRITE, DEFERRABLE;
+SHOW transaction_isolation;
+SHOW transaction_read_only;
+SHOW transaction_deferrable;
+SAVEPOINT x;
+COMMIT AND CHAIN;  -- TBLOCK_SUBCOMMIT
+SHOW transaction_isolation;
+SHOW transaction_read_only;
+SHOW transaction_deferrable;
+COMMIT;
+
 -- different mix of options just for fun
 START TRANSACTION ISOLATION LEVEL SERIALIZABLE, READ WRITE, NOT DEFERRABLE;
 SHOW transaction_isolation;