EDIT: I found another skeleton in the same world with this problem. He was around 20 chunks away from the first skeleton. I actually was able to hit him once, then I wasn't able to hit him again.
Daisy Garcia
EDIT: I found another skeleton in the same world with this problem. He was around 20 chunks away from the first skeleton. I actually was able to hit him once, then I wasn't able to hit him again.