IFrame API: Desktop Safari (13.1 od Ipad OS 13.5): TypeError: null is not an object (evaluating ‘e.getAudioTracks’) on Camera Activation

On current Desktop Safari (13.1 od Ipad OS 13.5) I get an JS exception when I want to activate the camera.

TypeError: null is not an object (evaluating 'e.getAudioTracks')

This error happens only if the room is all-ready created. If I am the first in the room, then the camera will be activated.
When I join the room without the IFRAME API directly with the jitsi meet url, then it works.
I have tested it with the latest nightly build (jitsi-meet_4649), the current stable version and the the public server https://meet.jit.si

Mobile Safari (IOS 13.5) works with IFrame API Setting

configOverwrite: {
 disableDeepLinking: true,
}

I reported the bug also on github: https://github.com/jitsi/jitsi-meet/issues/6865