When climbing down a ladder from a deer stand I had a MP5 in my hands with sufficient place in the backpack to fit it in. On the back I was carrying a rifle.
Arriving at the bottom of the ladder the hotbar indicated the gun is available.
When pressing the corresponding hotbar key the gun did not show up in my hands.
A look into the inventory showed the gun was gone. Searching the MP5 on and around the deerstand wasn't successfull. The empty places in the backpack were not accessible, so I assumed the gun still to be there. dropping the backpack and taking it up again did not change anything.
After relogging the gun was still gone but the empty spaces in the backpack were accessible again. Another search around the deer stand didn't bring up the MP5 again.
Earlier that day I had a similar issue after vaulting over a small concrete wall. There relogging showed the gun in the inventory again.
A little later on the same server I could not take pants from a shelf or interact with those. So i dropped my pants to the floor and could put on the pants from the shelf. My dropped pants disappeared, with the two mp5 magazines in it. As I had lost my Mp5 before, this wasn't that bad...
about 30 min later there was a scheduled restart of the server