Help, Weird thing is happening

Hello, I’m using WebRTC ^1.75.3

The problem i have is when i keep the app running and switch to another app and user joins, connection is not completed successfully, but when there is already one user, me and another user in a call and i go switch to another app and the third user joins it just works without any problem

Also if I’m in app it works even if im alone in the call.