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_0310_test	System table with keywords
bugs.gh_8061_test	Unnest IN/ANY/EXISTS subqueries and optimize them using semi-join algorithm
functional.metacache.core_4386_metacache_test	Error 'object in use' must NOT raise in 6.x with shared metacache (opposite outcome to prior versions).

This list is the same for:

5.0.4.1813 2026.04.20 d5e3647f	CS
5.0.4.1813 2026.04.20 d5e3647f	SS