So whenever players get into the truck, depending on where the truck spawned, when they fire the guns, the gun sound will be heard from where the technical was entered by a player.
Yup just had this happen too. My friend's game, in the same match, had the technical horn going off constantly even after I destroyed it. He did not hear the machine gun bug though.
Can't wait until they fix this. This is probably the most noticeable bug in the game.