PTT – Element Web (EW) often doesn't transmit audio / video to embedded EW in Element Android (EA) widget

[Johennes]

Describe the bug

Testing the EW / EA integration in https://matrix.to/#/#ecwidgettest:matrix.org, the media streams from EW often don't come through on EA.

To Reproduce

Steps to reproduce the behavior:

1. Join the call on EA
2. Join the call on EW
3. Notice how EA doesn't show the EW streams about half of the time

Screenshots

Additional context

https://github.com/matrix-org/matrix-video-chat-rageshakes/issues/775