I'm at a loss as to what the problem could be with my New Vegas build…

[Acmos1]

Hello everyone! Has anyone else encountered this problem? When finishing a first-person dialogue in New Vegas, a flash appears for a split second with a picture like the camera switches to a third-person view for that split second! If you start a third-person dialogue, there is no "flash" - and indoors too, this only happens outdoors. I have no idea where this came from... I tried disabling the latest installed mods (although they do not affect this at all) - it does not help. No build configurations were edited, a new game does not help either... This flash also depends on the direction of the player's gaze 0_o It appears when looking to the east, not appears to the west, half on the sides. It feels like it depends on the sun's illumination of the object, but the time of day does not affect this at all...

Edited July 25 by Acmos1