Problematic tests list (10 rows):

bugs.core_0733_test | Compress Data over the Network
bugs.core_2264_test | ALTER DOMAIN with dependencies may leave a transaction handle in inconsistent state causing segmentation faults
bugs.gh_7436_test | Backup error for wide table
bugs.gh_8488_test | MIN/MAX aggregates may badly affect the join order in queries with mixed INNER/LEFT joins
functional.arno.optimizer.test_opt_sort_by_index_10 | ORDER BY ASC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_13 | ORDER BY ASC using index (multi)
functional.arno.optimizer.test_opt_sort_by_index_19 | ORDER BY ASC using index (multi) and WHERE clause
functional.metacache.core_4386_metacache_test | Error 'object in use' must NOT raise in 6.x with shared metacache (opposite outcome to prior versions).
functional.replication.test_make_async_reinit_reliable | Make asynchronous replica re-initialization reliable #8324
functional.replication.test_sync_replica_server_hangs_on_disconnect | Synchronous replication hangs on disconnect [CORE6497]

This list is the same for:

4.0.7.3271 2026.04.18 1ab4f628 | CS
4.0.7.3271 2026.04.18 1ab4f628 | SS