If you run out of ammo on a Super Weapon, it’ll be revoked from you and the game will try to auto-switch to one of your normal weapons. This rarely works properly for me though; the weapon viewmodel usually pops up, but it’s as if I don’t have any weapon equipped at all. I can still swap to a weapon and it’ll work like normal, but sometimes the “fake” weapon’s viewmodel will stay visible on top of the one I’m actually using until I die.
I have never hosted a match of SDNL so I can’t say if it happens to the host too or not. Just mentioning since I have a hunch the bug might have something to do with networked weapon switching or something