This bug seems to appear after logging out of the Game do to an inventory Bug. Like items can't be moved around the inventory, can't be dropt or Picked-up ,or weapons can't be reloaded. While having a packed, but not full inventory.
After logging in again items often disappear from the inventory at random. It can be a Cann of food, a weapon, ammunition or bandages.
It doesn't seem to have a pattern.
Wearing endgame clothing > fill up your inventory > leave the game when encountering inventory Bug > reconnect and check for missing items
I did not encounter this myself, it always and only seems to appear on the character of my friend. The only time this seems to appear is when having a full inventory and can't seem to move Items in it.
There’s times were I can’t reload my weapon pressing “Y”, I’ll have to manually do it through the inventory.