Here are some bugs and odd things I noticed when I first played 1.16

1 - When using mouse and keyboard and moving around in your inventory or a chest / shulker / etc. and you keep moving your mouse around even just a tiny bit and close the item window it jerks your screen in a random direction, usually straight up or down

2 - I don't know if this is for every body but I randomly received the Minecraft Founders Edition cape and a pancake cape

3 - When using the elytra and the pancake cape, the cape disappears and you're left with an invisible elytra

4 - I breeded new villagers and traded with them way more then my old ones, my new villagers I could trade paper to for 16 emeralds before they ran out of stock, my old ones only gave me 6.

5 - When on top of water and not in swimming animation, if you crouch to go under and start swimming you won't be able to swim up anymore until you exit swim and reenter