I think it's an old bug: Sometimes the activated laser pointer on a weapon cannot be seen by other players.
It must be deactivated once, and activated again. Then the other players can see it again.
My impression is that the laserpointer is also not working when other players don't see it.
It is possible that this is caused by death or by reset position.
We noticed it in NF so I am not sure which zones are affected, or if it happens everywhere.