Problematic tests list (37 rows):

bugs.core_1746_test | Expression index can be created while doing inserts into table
bugs.core_1894_test | Circular dependencies between computed fields crash the engine
bugs.core_2140_test | Error messages after parameters substitution contains '\n' characters instead of line break
bugs.core_3450_test | Inefficient optimization (regression)
bugs.core_3610_test | Can insert DUPLICATE keys in UNIQUE index
bugs.core_3672_test | computed index by SUBSTRING function for long columns
bugs.core_3691_test | Missing constraint name in foreign key error message in FB 2.1.4
bugs.core_4386_test | Report more details for "object in use" errors
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_4819_test | EXECUTE PROCEDURE's RETURNING_VALUES and EXECUTE STATEMENT's INTO does not check validity of assignments targets leading to bugcheck
bugs.gh_7106_test | Wrong detection of must-be-delimited user names
bugs.gh_7200_test | DROP DATABASE lead FB to hang if it is issued while DB encrypting/decrypting is in progress
bugs.gh_7288_test | Server crashes when working with DSQL savepoints
bugs.gh_7545_test | Server crash on some LockMemSize values
bugs.gh_8391_test | gbak: Incorrect total statistics for restore
bugs.gh_8644_test | Connection error via Loopback provider if it's the first in the Providers parameter
functional.basic.isql.test_07 | Add REPLICA MODE to the output of the isql SHOW DATABASE command
functional.basic.isql.test_08 | ISQL showing publication status
functional.replication.test_blob_characters_garbled_when_conn_charset_differs | Characters are garbled when replicating fields with type BLOB SUB_TYPE TEXT if the character set of the connection and the field are different
functional.replication.test_blob_not_found_in_rw_replica_if_target_row_exists | Error "BLOB is not found" while replication converts INSERT into UPDATE for a conflicting record
functional.replication.test_blob_segments_longer_32kb_are_not_replicated | Problem with replication of BLOB segments longer than 32KB
functional.replication.test_bugcheck_in_rw_replica_after_conflicting_insert | Bugcheck 183 (wrong record length) could happen on replica database after UK violation on insert
functional.replication.test_dblevel_triggers_must_not_fire_on_replica | Replica DB must not fire DB-level triggers but their activity on master must be eventually seen in replica
functional.replication.test_ddl_triggers_must_not_fire_on_replica | DDL-triggers must fire only on master DB
functional.replication.test_disallow_rdb_backup_history_replication | Disallow replication of RDB$BACKUP_HISTORY
functional.replication.test_duplicates_in_rw_replica_after_conflicting_insert | Conflicting INSERT propagated into a read-write replica may cause duplicate records to appear
functional.replication.test_failed_ddl_commands_can_be_replicated | Failed DDL commands can be replicated
functional.replication.test_generator_could_not_be_transferred_to_replica | Generator values may not replicate after commit
functional.replication.test_invalid_msg_if_target_db_has_no_replica_flag | Invalid message in replication.log (and possibly crash in the case of synchronous replication) when the target DB has no its "replica" flag set
functional.replication.test_lookup_problems_for_intl_data_in_unique_indices | Lookup problems for INTL strings in unique indices
functional.replication.test_make_async_reinit_reliable | Make asynchronous replica re-initialization reliable #8324
functional.replication.test_shutdown_during_applying_segments_leads_to_crash | Crash or hang while shutting down the replica database if segments are being applied
functional.replication.test_some_updates_crash_server_on_replica_side | Some updates can crash Firebird server on replica side
functional.replication.test_sync_replica_allow_spaces_in_username_or_password | Leading, trailing or inner space character specified in 'sync_replica' must not cause error
functional.replication.test_sync_replica_server_hangs_on_disconnect | Synchronous replication hangs on disconnect [CORE6497]
functional.replication.test_uk_violation_in_rw_repl_if_constraint_name_is_used | PK/UK violation error raises in RW replica if constraint name is used to check uniqueness instead of index name
functional.replication.test_updating_blob_with_empty_string_stops_replication | Replication gets stuck due to "Blob xxx.xx is not found for table xxx" error

This list is the same for:

6.0.0.1850 2026.03.23 b8c59810 | SS
6.0.0.1853 2026.03.24 ac09834a | SS