I had a Blaze rifle equipped to my character. I entered a barn and went upstairs. After about 20 hours or so I logged back in to the same server, spawned in the exact same spot however my blaze rifle has disappeared from my inventory. I waited a few minutes to see if it would reappear but it did not. All other items including one being held in my hands were there as normal. The rifle is the only item to disappear.