diff -U3 /tmp/cirrus-ci-build/src/test/isolation/expected/change-function.out /tmp/cirrus-ci-build/src/test/isolation/output_iso/results/change-function.out
--- /tmp/cirrus-ci-build/src/test/isolation/expected/change-function.out	2025-05-24 03:28:11.368862499 +0000
+++ /tmp/cirrus-ci-build/src/test/isolation/output_iso/results/change-function.out	2025-05-24 03:31:31.779539041 +0000
@@ -18,6 +18,7 @@
 
 step c1: COMMIT;
 step alter_f: <... completed>
+ERROR:  tuple concurrently updated
 step r2: ROLLBACK;
 
 starting permutation: b1 b2 drop_f create_f1 c2 c1
@@ -27,6 +28,7 @@
 step create_f1: CREATE OR REPLACE FUNCTION f1() RETURNS INT LANGUAGE sql AS $$ SELECT 2;$$; <waiting ...>
 step c2: COMMIT;
 step create_f1: <... completed>
+ERROR:  tuple concurrently deleted
 step c1: COMMIT;
 
 starting permutation: b1 b2 create_f2 create_f1 c2 c1
@@ -36,4 +38,5 @@
 step create_f1: CREATE OR REPLACE FUNCTION f1() RETURNS INT LANGUAGE sql AS $$ SELECT 2;$$; <waiting ...>
 step c2: COMMIT;
 step create_f1: <... completed>
+ERROR:  tuple concurrently updated
 step c1: COMMIT;