This usually happens for me when I load into a world, and putting a torch in the dark area for a second usually fixes it.
In your world, are mob drops disabled in the world settings?
This has happened a lot when I'm playing survival with my friends, but not when I'm by myself.
I'm having the same problem on Xbox One. (1.14.60)
This also happens on Xbox One. (1.14.60)
This usually happens for me when I load into a world, and putting a torch in the dark area for a second usually fixes it.