A bug can occur when you are switching to another item while being scoped in with the crossbow.
how to reproduce the bug: keep holding RMB with the crossbow, then switch to any other item in your hotbar while still holding RMB.
what should normally happen: the zoom disappears and the vision goes back to normal.
Problem: you can get a bugged view, but it’s not very annoying.
i got a video here of what happens with this bug; I’m holding RMB and then pressing a number to switch to the pistol or rocket launcher.