For those of you (still) facing this issue, I solved it by reinstalling the default camera app using adb.
- Have a working ADB
- Find the correct package:
adb shell pm list packages -f "camera" - I transferred the APK it to my local pc (but this turned out to be unneccessary, as the APK remains on the device when uninstalling the app)
adb pull /system/priv-app/FPCamera/FPCamera.apk - Uninstall the current app:
adb shell pm uninstall --user 0 com.fp5.camera - (Re)install the app:
adb shell cmd package install-existing com.fp5.camera - Enjoy a perfect stock camera experience
