Problematic tests list (26 rows):

bugs.core_2264_test | ALTER DOMAIN with dependencies may leave a transaction handle in inconsistent state causing segmentation faults
bugs.core_3450_test | Inefficient optimization (regression)
bugs.gh_0310_test | System table with keywords
bugs.gh_3812_test | Query with SP doesn't accept explicit plan [CORE3451]
bugs.gh_8061_test | Unnest IN/ANY/EXISTS subqueries and optimize them using semi-join algorithm
functional.replication.test_blob_access_when_no_grant_for_select | Replicator must have access to the table with blob regardless SELECT grant on this table to the user who created blob.
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_duplicated_segment_numbers | Replicator could produce log segments with duplicated segment numbers
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_grantor_not_changes_in_replica_if_owner_not_sysdba | DDL-Changes in replication does not set the correct grantor
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_permission_error_on_ddl_issued_by_non_sysdba | Permission error with replication
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_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:

5.0.4.1796 2026.04.01 5f4829d8 | CS
5.0.4.1801 2026.04.03 ccf073af | CS