Teamfight tactics broke in carousal and beyond
In carousal it started with no one getting their units for the first neutral wave. Then we could buy and put stuff on, but an invisible, non-active unit took up a spot. The next round the new unit (#2) you put on the board disappeared. No combat at any point happened. By 2nd carousal the unit you got would stay tethered to you AFTER the 2-5 round and you could not sell or place them. They followed your sprite around on the combat board. After round 2-5 the game stopped working entirely and timers stopped existing.