Certain players are invisible.

This bug makes some players invisible to me. Because of this, I cannot play pvp minigames on servers at all due to this bug. The player is 100% invisible to me as I cannot see the armor they are wearing at all and the item they hold, I also do not see their username. It is not the invisibility potion either as they do not affect the armor people wearing, and the pvp minigames i was playing do not have said potions of invisibility.