It happened to me 3 times just today that I am sending this. (6/26/2020)
I was fighting some zombies right in front of my bed to try to sleep, but I got killed. Then when I tried to recover my items, they were gone. This was the first time. After I was trying to build in the sky, but accidentally I fell off and died. Again, when I tried to get my items right at the place that I died, they were gone, and this happened 1 more time doing the same thing.
I hope you guys could fix it, thank you so much for this grateful game, even though the bugs, but please fix it.