Problematic tests list (4 rows):

bugs.core_2264_test | ALTER DOMAIN with dependencies may leave a transaction handle in inconsistent state causing segmentation faults
bugs.gh_4314_test | Sub-optimal predicate checking while selecting from a view [CORE3981]
bugs.gh_6875_test | Significant performance regression of SIMILAR TO and SUBSTRING(SIMILAR) when pattern is taken from variable (rather than directly specified)
functional.replication.test_sync_replica_server_hangs_on_disconnect | Synchronous replication hangs on disconnect [CORE6497]

This list is the same for:

4.0.8.3276 2026.04.25 0d9cc6c8 | CS