I have problems with firewall rules in filter on this beta 5 v.They are not working.I use bridged interfaces on AP
You need to contact support (support@mikrotik.com) with attached support output file and problem description, if firewall rules do not work as it expected.
In bridge in winbox you have button click on button to check bridge packets pass firewall rules.
Posible is you problem. This is new feature.
Best regards.