looks like a broken screw I guess
yes
someone around here had one break
on their window frame
probably over tightened at the factory
or
cheaper that should have been screw
I have noticed over the years
many of these screws work themselfs out
I put a small dab of JB weld on the screw threads
then just screw them in until snug
they then stay put
and if not too much epoxy is used
screw will break free easily later if needed
Mountainman