diff -U3 /tmp/cirrus-ci-build/src/test/modules/commit_ts/expected/commit_timestamp_1.out /tmp/cirrus-ci-build/build/testrun/commit_ts/regress/results/commit_timestamp.out
--- /tmp/cirrus-ci-build/src/test/modules/commit_ts/expected/commit_timestamp_1.out	2024-03-21 16:29:26.434832000 +0000
+++ /tmp/cirrus-ci-build/build/testrun/commit_ts/regress/results/commit_timestamp.out	2024-03-21 16:48:08.812099000 +0000
@@ -39,24 +39,29 @@
        x.timestamp <= now() AS ts_high,
        roident != 0 AS valid_roident
   FROM pg_last_committed_xact() x;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter track_commit_timestamp is set.
 -- Test non-normal transaction ids.
 SELECT * FROM pg_xact_commit_timestamp_origin(NULL); -- ok, NULL
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  timestamp | roident 
 -----------+---------
            |        
 (1 row)
 
 SELECT * FROM pg_xact_commit_timestamp_origin('0'::xid); -- error
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  cannot retrieve commit timestamp for transaction 0
 SELECT * FROM pg_xact_commit_timestamp_origin('1'::xid); -- ok, NULL
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  timestamp | roident 
 -----------+---------
            |        
 (1 row)
 
 SELECT * FROM pg_xact_commit_timestamp_origin('2'::xid); -- ok, NULL
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
  timestamp | roident 
 -----------+---------
            |        
@@ -68,12 +73,14 @@
        x.timestamp <= now() AS ts_high,
        roident != 0 AS valid_roident
   FROM pg_last_committed_xact() x;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter track_commit_timestamp is set.
 SELECT x.timestamp > '-infinity'::timestamptz AS ts_low,
        x.timestamp <= now() AS ts_high,
        roident != 0 AS valid_roident
   FROM pg_xact_commit_timestamp_origin(:'txid_no_origin') x;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter track_commit_timestamp is set.
 -- Test transaction with replication origin
@@ -96,6 +103,7 @@
        r.roname
   FROM pg_last_committed_xact() x, pg_replication_origin r
   WHERE r.roident = x.roident;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter track_commit_timestamp is set.
 SELECT x.timestamp > '-infinity'::timestamptz AS ts_low,
@@ -103,6 +111,7 @@
        r.roname
   FROM pg_xact_commit_timestamp_origin(:'txid_with_origin') x, pg_replication_origin r
   WHERE r.roident = x.roident;
+WARNING:  outfuncs/readfuncs failed to produce an equal rewritten parse tree
 ERROR:  could not get commit timestamp data
 HINT:  Make sure the configuration parameter track_commit_timestamp is set.
 SELECT pg_replication_origin_session_reset();