Room timeline consists only of lastest "m.call.*" events after a voice call

[menturion]

Synapse: v1.15.0 matrix-js-sdk: v6.2.1

Currently, I'm trying to implement voice/video calls in a client based on matrix-js-sdk (import).

Everything works fine so far, however, after hanging up the call, e.g. in a 1-to-1 direct room, the timeline consists only of the latest "m.call.*" events.

I have to send e.g. a text message to get the full timeline back for the room.

Any idea what might be wrong? Is there a way to force updating the room timelne upon a call hangup event?

Many thanks in advance.