Yes i had a shelter and wooden box crafted and both vanished when i was gathering stuff.
What i did was putting my stuff in a vehicle or hiding it in a house wich is risky but better then everything gone the moment you turn around.
The issue is also that you cannot "maintain" anything from fires to shelters !
It just says: 0 days - 0 hours - 0 minutes
Other then that the server runs stable !!!