Problematic tests list (5 rows):

bugs.core_4337_test | gfix -sweep makes "reconnect" when it is removed from mon$attachments by delete command (issued in another window)
bugs.core_4342_test | Non-privileged user can delete records from RDB$SECURITY_CLASSES table
bugs.core_4344_test | Error "no current record for fetch operation" when table inner join procedure inner join table
bugs.core_4345_test | Ability to trace stored functions execution
bugs.core_4350_test | Support the SQL Standard ALTER SEQUENCE .. RESTART (without WITH clause)

This list is the same for:

6.0.0.1881 2026.04.05 0f9d237d | SS
6.0.0.1902 2026.04.15 3c5a73c1 | SS
6.0.0.1910 2026.04.20 99191e03 | SS
6.0.0.1937 2026.05.08 a7eefb3f | SS