Yeah it disappears in 1st person view when you get out of any vehicle and even most times when equipping them.
I have found that removing all your clothes then re-equipping them sometimes helps; Reloading sometimes helps; and re-loading the game sometimes helps. I don't know. lol
After more testing it seems these go invisible in first person when glasses or a hood is equipped. Once the glasses and the head piece is removed they are visible again.
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edit: It disappears in 1st person view after you get on a motorcycle
I have found that removing all your clothes then re-equipping them sometimes helps; Reloading sometimes helps; and re-loading the game sometimes helps. I don't know. lol