It took a day to confirm, but after numerous experiences with friends, as well as staff verification, it is safe to say that disguising as a player makes your character invisible. This can be problematic for PvP based worlds, like the Nether or the End, as this bug gives an unfair advantage. How to reproduce: /d p <username> What I expected: I will appear as another player. What really happened: I became invisible to those around me. One I undisguised, I became visible to other players again.
