Problematic tests list (36 rows):
bugs.core_1715_test  Incorrect "key size exceeds implementation restriction for index" error
bugs.core_4067_test  Problem with "CREATE DATABASE ... COLLATION ..." and 1 dialect
bugs.core_4524_test  New gbak option to enable encryption during restore
bugs.core_4864_test  CREATE DATABASE fail with ISQL
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_5630_test  Can't create the shadow file
bugs.core_5790_test  User with DROP DATABASE privilege can't drop database
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.core_6208_test  CREATE DATABASE grant is lost in security.db after backup/restore cycle
bugs.core_6316_test  Unable to specify new 32k page size
bugs.core_6412_test  Firebird is freezing when trying to manage users via triggers
bugs.core_6441_test  Srp plugin keeps connection after database has been removed for ~10 seconds (SS and SC)
bugs.gh_6860_test  Create user statement fails with SQLSTATE = HY000 when using DataTypeCompatibility
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_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_8278_test  Avoid index lookup for a NULL key if the condition is known to always be FALSE in this case
bugs.gh_8501_test  fix(cast-format): Throw exception when value cannot be found for specific pattern in string to datetime conversion
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.metacache.test_95996928  Avoid infinite wait due to non-optimum plan & use of read committed no record version transaction for DML by ISQL
functional.package.test_33384b2e  Packaged temporary tables. Only `INSERT` is allowed for them in the package body units
functional.session.test_ext_conn_pool_01  External Connections Pool, functionality test 01
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_disconnect_05  ON DISCONNECT trigger and OnDisconnectTriggerTimeout expiration
functional.trigger.database.test_transactioncommit_01  Trigger on commit transaction. See also CORE-645

This list is the same for:
6.0.0.2090 2026.07.21 eecfe010  CS