Problematic tests list (41 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_5618_test  Part of the pages of the second level blobs is not released when deleting relations
bugs.core_5884_test  Initial global mapping from srp plugin does not work
bugs.core_5904_test  An attempt to create global mapping with long (greater than SQL identifier length) FROM field fails
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_6078_test  Permissions for create or alter statements are not checked
bugs.core_6095_test  Extend trace record for COMMIT/ROLLBACK RETAINING to allow chaining of transaction ids
bugs.core_6143_test  Error 'Multiple maps found for ...' is raised in not appropriate case
bugs.core_6147_test  PLG$SRP table, PLG$SRP_VIEW View instructions are strangely added in the metadata script extracted when Windows trusted authentication is enabled
bugs.core_6329_test  GBAK with service_mgr and WinSSPI authentication for Windows SYSTEM user producing error in clumplet API
bugs.gh_0310_test  System table with keywords
bugs.gh_4203_test  DROP [IF EXISTS]
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_7046_test  Make ability to add comment to mapping ('COMMENT ON MAPPING ... IS ...')
bugs.gh_7050_test  Add table MON$COMPILED_STATEMENTS and columns
bugs.gh_7304_test  Events in system attachments (like garbage collector) are not traced
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_8062_test  CREATE [IF NOT EXISTS]
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_8219_test  Database creation in 3.0.12, 4.0.5 and 5.0.1 slower than in previous releases
bugs.gh_8253_test  Incorrect handling of non-ASCII object names in CREATE MAPPING statement
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_8663_test  Problem with restore time when DB has many indices (possible regression in 6.x)
bugs.gh_8851_test  'Internal error' when calling outer procedure after deleting unused result variable from inner procedure
bugs.gh_8968_test  Incorrect check of the limit on the number of local temporary tables
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.ltt.test_ltt_savepoints_2  LTT. Regression with SAVEPOINTS.
functional.syspriv.test_change_mapping_rules  Check ability to manage auth mappings
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:
6.0.0.2186 2026.09.26 6fed602c  SS
6.0.0.2187 2026.09.27 f286d423  SS