What apps? Because some time ago Google made changes to how this works and apps must ask user to grant them permission to draw over other apps.
When upgraded to a newer version of Android, permission was not removed for already installed apps. But on new device, you most likely have to grant...
I've encountered this, but only with my 5 port Aukey charger that does not support PD on its USB-C port and it happens once battery is charged over 10%. Someone on Reddit also had this only with 5 port charger without PD support.
Issue does not happen on official charger from the box for me.
Currently every phone must be approved/whitelisted by carrier for VoLTE / VoWiFi or you must download carrier's app for VoWiFi (if they released it).
It's a good will of a carrier if they approve phones that are not sold by them.