Problematic tests list (21 rows):

bugs.core_0733_test | Compress Data over the Network
bugs.core_5501_test | Unclear gstat's diagnostic when damaged page in DB file appears encrypted
bugs.gh_7304_test | Events in system attachments (like garbage collector) are not traced
bugs.gh_8391_test | gbak: Incorrect total statistics for restore
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_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_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:

5.0.3.1635 2025.03.31 22ec6faa | SS
5.0.3.1649 2025.04.21 5b2d0dcc | SS
5.0.3.1650 2025.04.30 6253fe18 | SS