Problematic tests list (30 rows):
bugs.core_0733_test  Compress Data over the Network
bugs.core_1095_test  Support `BETWEEN` predicate for select expressions
bugs.core_1271_test  Ceation of invalid procedures/triggers allowed
bugs.core_1725_test  Unable to restore a database with inactive indices if any SP/trigger contains an explicit plan
bugs.core_2957_test  count(*) from big table returns negative result
bugs.core_4371_test  Create function/sp which references to non-existent exception: error message is "Error while parsing function's BLR" instead of "exception not defined"
bugs.core_5501_test  Unclear gstat's diagnostic when damaged page in DB file appears encrypted
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_8421_test  Add pointers tree to TempSpace class
bugs.gh_8749_addi_test  RDB$RECORD_VERSION has wrong value when is used in BEFORRE trigger and RETURNING INTO.
bugs.gh_8749_test  Computed index on RDB$RECORD_VERSION don't work as expected
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_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_oltp_emul_ddl  Applying full DDL from OLTP-EMUL test on master with further check replica
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_server_hangs_on_disconnect  Synchronous replication hangs on disconnect [CORE6497]
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:
5.0.4.1748 2026.02.17 153b7f6e  SS