All mobs freeze up and stuck in flight mode

I was AFK'ing overnight at my slime farm, then 30 seconds after moving around, all mobs, golems, villagers etc just froze and i get stuck in Flight mode (as though i am flying with the elytra or swimming). I can still move around etc but stuck in that orientation and every time i jump i am stuck in flight. The game doesn't crash, it just gets stuck, and i have to task manager kill java to exit the game as exit and saving just hangs on the "saving world" screen.

PS: Just tried loading it up on 19w46a and does the same thing