Mikrotik + IPTV (Multicast UDP) in the direction of the bridge works in the direction of the interface no, why?

Question

Mikrotik

Good afternoon,
there is a piece of iron with 5 ports + WIFI:
Ports:
1. ADSL (Internet provider) (Master port: None)
2. a small raspberry switch is connected to it (PI2 as a player and tuner) (Master port: None)
3. NAS (Master port: 2)
4. IPTV provider (Master port : None)
5. Empty (Master port : 2)
/routing igmp-proxy> interface print
Flags: X - disabled, I - inactive, D - dynamic, U - upstream
# INTERFACE THRESHOLD
0 bridge-local 1 U ETH4
In the bridge ETH2 + WLAN2 + WLAN 3 (While I made a filter so that multicast in the direction of vlans is cut)
Question:
If there is a bridge as the receiving party in the IGMP proxy, TV shows. If you specify ETH 2 instead of a bridge (a raspberry sits there), it does not show, tell me why.

Answer 1

on port 2 is the ip address exactly worth it?

Answer 2

Dev response:
you have to set the master interface as an interface in IGMP-proxy
configuration. When you add the interface to the bridge or set
master-interface for it - it becomes slave interface and many features of RouterOS will
stop working on that interface.
Conclusion: if the interface is a master, you need to pull it out of any bridge, configure routing ...
I'll check it out