Problematic tests list (25 rows):
bugs.core_4754_test  Bugcheck 167 (invalid SEND request) while working with GTT from several attachments (using EXECUTE STATEMENT ... ON EXTERNAL and different roles)
bugs.core_5275_test  Expression index may become inconsistent if CREATE INDEX was interrupted after b-tree creation but before commiting
bugs.core_5481_test  Available indices are not used in some cases if ORDER BY expression is a filtered one
bugs.core_5488_session_idle_test  Timeouts for running SQL statements and idle connections
bugs.core_5501_test  Unclear gstat's diagnostic when damaged page in DB file appears encrypted
bugs.core_5921_test  Provide information about Global Commit Number, Commit Number of currently used database snapshot (if any) and Commit Numbers assigned to the committed transactions
bugs.core_6095_test  Extend trace record for COMMIT/ROLLBACK RETAINING to allow chaining of transaction ids
bugs.gh_0310_test  System table with keywords
bugs.gh_6802_test  When the statement timeout is set, it causes the lock manager to delay reporting deadlocks until timeout is expired
bugs.gh_7050_test  Add table MON$COMPILED_STATEMENTS and columns
bugs.gh_7398_test  Worst plan sort created to execute an indexed tables
bugs.gh_7466_plans_tracking_test  Add COMPILE trace events - ability to see execution plan of every PSQL statement.
bugs.gh_7466_test  Add COMPILE trace events for procedures/functions/triggers
bugs.gh_7804_test  The partial index is not involved when filtering conditions through OR.
bugs.gh_7904_test  More realistic cardinality adjustments for unmatchable booleans // FB5 bad plan for query
bugs.gh_8077_test  Error "Too many recursion levels" does not stop execuition of code that uses ON DISCONNECT trigger (FB 4.x+)
bugs.gh_8161_test  Cardinality estimation should use primary record versions only
bugs.gh_8278_test  Avoid index lookup for a NULL key if the condition is known to always be FALSE in this case
bugs.gh_8851_test  'Internal error' when calling outer procedure after deleting unused result variable from inner procedure
functional.arno.optimizer.test_opt_inner_join_05  INNER JOIN join order LIKE and STARTING WITH
functional.dtt.test_dtt_max_count  DECLARED TEMPORARY TABLE - check max limit for DTT that can be created within each kind of PSQL unit.
functional.metacache.test_95996928  Avoid infinite wait due to non-optimum plan & use of read committed no record version transaction for DML by ISQL
functional.table.alter.test_05  ALTER TABLE - ALTER - TO
functional.trigger.alter.test_alter_dml_basic  ALTER TRIGGER - basic checks for DML triggers
functional.trigger.database.test_transactioncommit_01  Trigger on commit transaction. See also CORE-645

This list is the same for:
6.0.0.2164 2026.08.29 2d371e28  CS
6.0.0.2164 2026.08.30 181f3217  CS
6.0.0.2165 2026.08.30 a033b92f  CS
6.0.0.2165 2026.09.01 10ae5fb3  CS
6.0.0.2167 2026.09.03 565110fe  CS
6.0.0.2173 2026.09.04 b8bbd781  CS
6.0.0.2173 2026.09.07 f8e61483  CS
6.0.0.2174 2026.09.08 2b203c0e  CS
6.0.0.2177 2026.09.11 a8065634  CS