Floating Blocks After Death

Hi! Something unexpected happened to me in the game.

I was collecting resources to clear a path inside a cave (or house), when I was suddenly attacked by two zombie mobs. After dying and returning to the spot, I noticed that my dropped items were floating in the air — some of them even appeared in the image. The problem is: they couldn’t be picked up again.

Please take a look into this issue. Thanks in advance!