Glitches caused by 1.19.20 update

After the 1.19.20 update, a second player entering an already created world would cause the game to have an error and to crash. When creating a new world, the horses, llamas, and villagers are very glitchy. Horses flash and/or are black, llamas have no eyes, and all villagers look the same (like normal, non-trading villagers).