When you start a round and your soldier loads starts to load clip if you press B to equip the gas mask (before the loading is complete) you will equip the gas mask but your gun will not reappear. You have to switch to your secondary and then back to your primary to fix.
Another bug sometimes when you die you get a cam which you can fly around the map.(it feels like a spectator cam?) Enemies are not marked but you have the freedom to see what is going on. Not sure what causes this. A side effect of this is you can fly into a restricted area and when you spawn your character cannot shoot - as if they are still in the restricted area