I think the reporter may have mobs simply left over from the night,seeing as one of his other "bugs" was not being able to leash hostile mobs.
This actually happens to me a lot in multiplayer, the same thing happens with the respawn button. I think it might have something to do with chunks unloading being visible and having to do it so fast.
I think the reporter may have mobs simply left over from the night,seeing as one of his other "bugs" was not being able to leash hostile mobs.