1.16.220.52 update erased player 2 entirely

Updating to 1.16.220.52 erased player 2 in our local split screen multiplayer entirely, and every time player 2 tries to join, it erases them again, and puts them at world spawn. Player 1 still has all items and levels, but player 2 is created as if brand new, every time they log back in. Previously, we could have player 1 quit completely and reload and player 2 would log in, intact, but this update today completely destroyed all ability to bring back player 2's profile. Please help, this is unplayable if player 2 loses everything, every time we try to play.