Your username: Sellz In which minigame/server does the bug occur: Every server which includes the "Invisibility clock". Detailed description of bug: Well, the bug works like this. When you see a person who is disguised as an animal, or a player, you can use to clock to bypass the disguise, which makes you see who the person is in /disguise. Here I have an example: ( Thank you @MappyTurtle ) As you could see, @MappyTurtle is disguised as a chicken to not be seen, you can't see her nametag or anything. But when you make everyone invisible with the clock, and visible again. You see this. You can see Mappy as player, and the disguised animal is still visible inside her. This bug also works for people who are vanished, well, at least that's what Mappy said, in the private message in the second image. This can bypass staff members who are disguised trying to give warnings to people who are breaking in-chat rules.
Not to be rude, but I don't think you have actually confirmed it. It was fixed for /vanish over a month ago. It does work for disguises though, I'll fix that at some point in the future, but it's not one of my priorities right now.