I have found a few bugs while playing the 1.13.0.13 beta. Here are all I've found.

• Zombies don't have animations and their arms are at their sides.
I can't figure out what causes this. They spawn fine but then randomly don't have animations and I can't fire out how to make it happen.

• Paper Doll doesn't have any animations.
The Paper Doll stays in the default pose even when running or crouching. The animation when drawing a bow still plays in the Paper Dolls hand. Armor and items are positioned and displayed correctly

• Panda's head is broken.
When sitting, the Panda's heads are stuck facing down.

• Walking after opening UI.
If you're moving when you click on a Crafting Table, Furnace, Blast Furnace, and Smoker, you continue moving in the same direction while the UI is open.

• Auto-jump on Walls.
When walking up to walls (2 blocks or higher) Auto-jump causes you to jump.

• Sleep Standing
The sleep animation plays correctly, but the character is standing up.