IGMP proxy cannot load VLAN interfaces?

[Reiter der OPNsense]

Hi folks
In the German part of the forum nobody has reacted yet, maybe it will work here. 

Problem: The IGMP proxy doesn't seem to load VLAN interfaces, see second outputs here:
https://forum.opnsense.org/index.php?PHPSESSID=f5ok07kdd6hojtmpahcjloeti7&topic=9570.msg43701#msg43701
Normal interfaces (not VLAN) are loaded normally, as can be seen in the first outputs.

Can someone reproduce this? Is this a known problem? Or is it just on my box?

Thanks.
Stefan