They have all the same hitboxes, act the same, but you can only see their red eyes, the rest of the body is transparent.
Comments 3
Thank you for your report!
We're tracking this issue in MC-26831, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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This actually isn't a glitch. If you're playing in hard difficulty, they can sometimes spawn with the "invisibility" status effect.