Problematic tests list (48 rows):
bugs.core_1152_test  Cannot erase a table with check constraints referencing more than a single columns
bugs.core_1401_test  Global temporary table instance may pick up not all indices
bugs.core_2712_test  Do not print "invalid request BLR" for par.cpp errors with valid BLR
bugs.core_3690_dialect_3_test  Wrong warning message for ambiguous query
bugs.core_4731_test  Prohibit an ability to issue DML or DDL statements on RDB$ tables (CORE-4731)
bugs.core_4819_test  EXECUTE PROCEDURE's RETURNING_VALUES and EXECUTE STATEMENT's INTO does not check validity of assignments targets leading to bugcheck
bugs.core_4937_test  View/subselect with "union" does not use computed index
bugs.core_5275_test  Expression index may become inconsistent if CREATE INDEX was interrupted after b-tree creation but before commiting
bugs.core_5383_test  Dependencies in Package not recognised
bugs.core_5393_test  Bad optimization of some operations with views containing subqueries
bugs.core_5410_test  Dependencies are not stored when using some type of contructions in subroutines
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_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_6142_test  Error "connection lost to database" could happen when application creates few local attachments (using XNET) simultaneously
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_6869_test  Domain CHECK-expression can be ignored when we DROP objects that are involved in it
bugs.gh_7050_test  Add table MON$COMPILED_STATEMENTS and columns
bugs.gh_7220_test  Dependencies of subroutines are not preserved after backup restore
bugs.gh_7398_test  Worst plan sort created to execute an indexed tables
bugs.gh_7426_test  Ensure the DDL trigger requests are cached
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_8661_test  Strange output from SHOW DEPENDENCIES command on 6.0
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.basic.isql.test_02  ISQL - SHOW SYSTEM TABLES
functional.basic.isql.test_03  ISQL - SHOW SYSTEM parameters
functional.gtcs.test_computed_fields_13  Computed fields
functional.gtcs.test_misplaced_collation_in_extracted_metadata  Misplaced collation when extracting metadata with isql
functional.gtcs.test_returning_01  Test of RETURNING clause: INSERT, UPDATE, MERGE.
functional.ltt.test_ltt_get_table_stat  LOCAL TEMPORARY TABLE - get table access statistics using API
functional.ltt.test_ltt_object_in_use  Checks for 'object in use' when doing DDL changes in LTTs.
functional.ltt.test_ltt_savepoints  Check support of SAVEPOINTS in local temporary tables.
functional.metacache.test_8b4893b3  Shared metacache. DROP <UNIQ_CONSTR> while concurrent Tx involving appropriate index; verify RDB$ content for such intermediate state.
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.metacache.test_ee28aa6f  Hang (assert in DEV) with ALTER TABLE tbl ALTER fld TYPE ... when "tbl" has conditional index and condition depends on "fld"
functional.package.temp_tables_multiple_indices_test  Temporary tables in packages (#8974) - multiple indices
functional.package.test_33384b2e  Packaged temporary tables. Only `INSERT` is allowed for them in the package body units
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:
6.0.0.2023 2026.06.20 b9e55b08  CS