I’ve had two occasions recently wherein a poxburster showed up and was completely silent until they were blowing up. They seem to make some noise before approaching the players while behind the wall/door but then become completely silent at some point
I think the specific bug with this is that they turn entirely silent sometimes when waiting behind the door like that. Seems to happen at certain doors more often, too. No idea why they’re waiting so long right behind the door anyway. It’s like they freeze and the ticking noise is tied to their movement or something
Specials wait at the doors for a short moment so they (normally) make sound and alert the players to their presence before exiting the door. In the betas and pre-launch, specials would instantly move through doors and it was pretty terrible for players to have specials like bursters, dogs & trappers instantly teleporting and attacking players through the doors.