The NIN invisible bug is very rare and hasn't been fully fixed yet, I remember seeing it in a ranked Feast match one time where the player (who I know as a friend) was invisible showed what it was like on their view and they were perfectly normal on their screen but nobody could see them, I probably was in the same match as Ash as well when it happened. I've only seen it once or twice so at least its a rare bug and not a exploit that's going around.

Also Aimbot in FF, I've heard it all now lmao