I'm currently in this call, except I'm not

#### Describe the bug
Received a (matrix native) video call, was slow to answer since element-phone did not ring(!). I suppose it's what I get for using F-Droid. I noticed because desktop was ringing at the same time.

The other party hung up, I still could and did answer.
Now desktop shows This call has ended while android shows You're currently in this call.

Getting called again, I took the call again, somehow it crashed. Desktop is showing I missed this call.

Now I'm calling back and it's ringing but desktop shows This call is in an unknown state.

#### To Reproduce
s.a.

#### Expected behavior
s.a.

#### Screenshots
/

#### Smartphone (please complete the following information):
- Device: Moto G5S+
- OS: Android 10

#### Additional context
- App version and store: Schildi beta 1.1.15.sc40-test5 Fdroid
- Homeserver: private

Add any other context about the problem here.