Created a ticket with this issue + reproduction steps. You will have to take it off to get rid of the effect but after some time this will happen again.

Are you wearing a Ghillie Suit? Got the Same while wearing a Full Ghillie.

anyone seen a combat knife? Haven't found one for ages. If yes where do they spawn?

I've seen AK Bayonets and Pouches in some vids. The Pouches and the Bayonet seem to be extremely rare but spawning according to some forum posts. Tactical Vest has been removed ages ago due to clipping issues and it was just an item that was copied from Arma 3. But i agree on Chainsaw and also haven't seen a gun holster but haven't played too much since 0.54.

Hope they fix this soon because this is kinda close to game breaking for me if every update just adds content and other things disappear and don't get fixed in the next update. For example i was really hoping to get a silenced pistol until i noticed that the silencer isn't spawning. Same with the MP5, without the attachments mainly the stock it's not really worth keeping in my opinion because it looks crappy without and the recoil must be much higher if attachment effects are actually in game. I'm mainly missing the glasses at the moment because they were actually in game and they were really cool for covering your face(together with balaclava/mask) or just for the looks.

Mosin Bipod was the Atlas Bipod but for some weird reason Bohemia decided to not let us attach it to the Mosin anymore. Might be about the missing attachment rails on the Mosin but seriously as long as there are no other sniper rifles in game there should be a bipod for it because the aim is quite unsteady even with the hold breath option.

Tactical Vest was removed as far as i know because It was copied from Arma 3 and had lot's of clipping issues etc.

Sunglasses should be fixed in the next patch as mentioned today by a moderator but still nothing about the rest.Btw is the central loot economy really in game already? Otherwise i think it might be fixed with a patch that improves the loot economy. SVD was also confirmed a long time ago but is on halt due to loot economy as far as i know.

The Sunglasses are missing

Has anything changed in 0.53? Haven't seen the missing 0.52 items yet.