If you play on 1.16 its really easy to get like stuck in blocks and water so you cant get out of it. And if you are very unlucky it can happen in a fight. It is pretty annoying. They should really get that fixed. Is it fixer or not because i play on 1.8 at the moment.
Like you said 1.16 is very laggy on some gamemodes so I recommend playing on 1.8.9 for pvp gamemodes.