1.3.0.52
No mods
The machinegun nest for either faction seems to interact weirdly when firing since the new update, the bullets are completely inaccurate and the gun itself has a weird animation that makes it seem like rounds are detonating immediately after exiting the barrel. This doesnt appear to be an issue with the stand alone gun, just when it is part of the machinegun nest.
Open up gamemaster and place a machinegun nest aswell as a NSV or M2 standalone gun.
Fire both, preferably with tracers to see projectile in flight
Compare the two
Same situation with both the US and soviet non camo net machinegun nests. Seems to only effect the built weapon systems from my testing, the armed vehicles appear to still fire correctly as do the standalone non emplaced weapons.