When eating or drinking the can/bottle is invisible.
Also sometimes weapons become invisible especially if you're carrying more than one.
Other times you will appear to be carrying an invisible weapon and be unable to unequip it unless you throw it and it will pull the weapon off your back and throw it.
1.) Invisible item in hand glitche (sometimes occurs when vaulting)
2.) raise invisible weapon and press G to throw
3.) weapon on your back disappears
Sometimes hands will appear to be empty but you cannot place items in them
Got invisible things in hand and it's impossible to switch.
Nothing to do except log out.