I've had that happened to me twice since the new update. I didnt know when or why it occured, I tought I somehow might of dropped it by accident. My only thing that is different from you is that I got kicked from the Official server, without reason, as usual. Then when playing a little bit after logging back in I noticed my pan and my stuff inside dissapear. Please fix this this is terribly game breaking!

When the update came out i was kicked very often during the first hours. But now after a few days it comes a bit better with the kicks from server.

Now i check out if the loot get lost when i split them in my bag