Have you been able to test your device in safe mode to see if your symptom persist? You can do so by following these steps.
Press and hold the power button until power off, restart, and emergency mode show on the screen
Tap and hold on the power off option until it changes to safe mode, then tap on safe mode
The phone will then reboot into safe mode. You will be able to check that it is by a grey transparent box in the bottom left of the screen that says safe mode.
this happens with me as well.. this causes the front camera to be in only one single focus no options to select... the video calling is very poor quality on the video. None of the video calling apps have clear view using front facing camera. i exchanged my phone thinking it was a faulty one.. the second one is also having the same issue. The camera enlarges from normal punch hole to a bigger puch hole automatically to 32 MP on front facing when you do video calling.. this needs a fix..heard so many people complaining about it.. this is basic stuff to have video calling well.. this is not purely becuase of internet or connectivity.. even before you do a video call the apps show the preview of the video which are very shabby no clarity at all.