a ''Invisible'' bug

I was playing eggwars but someone was killing my teammates, and its invisible, i cannot hit he, i thought it was a hacker, but when the second time i saw another player that even dont have a account in invisible, i realise this is a bug, if you cannot see others in a eggwar or skywar anything of battles, this will become the worse thing i could ever feel, this must be fixed, this bug will ruin all this game, all the mentality of players, a round that you 100% can win, this bug will make you lose, even youre the strongest player in the world.