What could cause moving bar around punch hole?

Galaxy s21 Ultra, Android 11

Locked phone laid in front of my eyes and I noticed white spot on the phone around camera’s punch hole. Several times before I have also noticed moving bar around camera’s punch hole. That was when opening camera app and during face recognition to unlock. I don’t know exactly whether that white spot was the same as bar in those cases. Could that be caused by some spying software that uses front camera?

At the time, there was 6 apps having access to camera while they are in use.

After that I installed Access Dots app to see when front camera is active.

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