I do not need in-bridge masquerade.

Hello
There is RB1100X2 in lab with connected couple of UDP multicast streams.
Most pots are in the bridge, except one which is the output of the world. Every time when I turn on masquarede in firewall/nat with any filter (like output port of the all-ppp or output port_my_way_to-internet) multicast packets passing through interfaces in the bridge, as the source IP address getting bridge’s IP.
Why does not function selectors in IP/FIREWALL/NAT in this case ?
Packages should probably go without substitution source address if pass through the interfaces belonging to the same bridge?
Hmm


BTW
When MikrotiK will make ds-lite package ?