Confirmed

Pupils dilate and constrict depending on the light source?

This is a game feature not a bug, I haven't noticed it myself so I don't think it is that dramatic, maybe it just seems a little sudden to you and they could, in a much later patch, include a fade time between the brightness changes?

Just tried to reproduce this to no avail, I really think this is related to a connection issue.

Maybe just desync not reconnecting?

Returned to my body on respawn literally like 2 minutes later and it was no longer there/probably disappeared...