screen sharing while already in a call looks like a new incoming call

Is the following normal behavior?

while in a rainbow voice call with 2 persons and after a while somebody wants to share his screen clicks the screen share button OK.

the guest on the other side receives another incoming call on mobile and pc to accept, voice falters also for a moment. If you accept, both are merged and you see the screen and the voice from before.

We had already the same in a bubble 1-1 or in a private conversation 1-1.

Some people are logged in on mobile phone with the rainbow app, on the computer (RDS) and in a chrome browser at the same time bur as far as i know, that should not be the problem?