asterisk users - Nov 2019 - Own MOH incorrectly kicking in instead of the MOH of the callee

Hello all!

I'm reproducibly getting my *own MOH* if I should get the MOH of the Callee
instead. I can see this with asterisk 13 and 16 (and probably before, too). The
reason of the
wrong MOH is an in dialog reInvite received from trunk, which sends a SDP
containing

a=sendonly

After this reInvite, I can hear own MOH instead of the MOH of the Caller. The
situation is cleared by another reInvite received from the trunk containing

a=sendrecv


Is this expected behavior? I don't think it should act like this.

BTW: I'm additionally using FreePBX. Maybe it's a problem of FreePBX?


Thanks
Michael