But it was working properly in auto mode before this OS update, so I do not understand why it was removed if it was actually working properly?

I am trying to mark local VoIP packets on RB951G-2HnD v6.29.1, but it looks like bridge traffic does not go through the firewall. We have a PBX in a local network, and I would like to mark and prioritize VoIP packets in local network. All VoIP phones and and VoIP traffic is only in the local network...