diff -U3 /tmp/cirrus-ci-build/src/test/regress/expected/alter_table.out /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/alter_table.out
--- /tmp/cirrus-ci-build/src/test/regress/expected/alter_table.out	2024-09-23 08:34:17.849944613 +0000
+++ /tmp/cirrus-ci-build/src/bin/pg_upgrade/tmp_check/results/alter_table.out	2024-09-23 08:40:06.409651473 +0000
@@ -3911,7 +3911,8 @@
 );
 CREATE TABLE fail_part (like unparted);
 ALTER TABLE unparted ATTACH PARTITION fail_part FOR VALUES IN ('a');
-ERROR:  table "unparted" is not partitioned
+ERROR:  ALTER action ATTACH PARTITION cannot be performed on relation "unparted"
+DETAIL:  This operation is not supported for tables.
 DROP TABLE unparted, fail_part;
 -- check that partition bound is compatible
 CREATE TABLE list_parted (
@@ -4281,7 +4282,8 @@
 -- check that the table is partitioned at all
 CREATE TABLE regular_table (a int);
 ALTER TABLE regular_table DETACH PARTITION any_name;
-ERROR:  table "regular_table" is not partitioned
+ERROR:  ALTER action DETACH PARTITION cannot be performed on relation "regular_table"
+DETAIL:  This operation is not supported for tables.
 DROP TABLE regular_table;
 -- check that the partition being detached exists at all
 ALTER TABLE list_parted2 DETACH PARTITION part_4;