Xbox one X - Dayz 1.18.154955.
Basically you or anyone else bugs, usually one of your arms disappears, the other players see something in your hand, a knife for example (which in reality does not correspond to what is actually in your hand, in the case of the video below it was a M4), you can't see the gun, you can't hear the gunshots, just the sound of the shots when they hit close to you.
{F2747179}
In this other case, one of the arms didn't disappear (it's another player, not the guy in the video above), but the same thing is repeated, he had a MOSIN in his hands, invisible and inaudible, you can only hear the recharge sound and shots hitting the wall.
{F2747202}
Undoubtedly, update 1.18 broke the game on several levels: inventory, performance (more than it already was), recurring crashes and that... a massive desync problem between players.