Problematic tests list (5 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.blob.test_open_blob_without_select | Open BLOB without selection
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:

5.0.5.1816 2026.04.21 4ff41c4c | CS
5.0.5.1816 2026.04.21 4ff41c4c | SS