im waiting for a fix as well, it started with me being able to use it and my boyfriend could not so i gave him the one i was holding and then both of ours broke haha, still broken ever sense then (creative mode only)
Known Issue : Spawning a weapon that does not use standard ammo types (Grappler / Harpoon Gun / Plasma Cannon / etc.) with ammo set to 0 (zero) will cause it to be non-functional.
I’m having the same problem as the original poster, but it’s in random creative maps, where i didn’t create the map. Even if i play public maps, i’m not able to shoot it but everyone else is.