All the textures except for the rendered blocks are wrong and often flickery. Lines flicker randomly across the screen as well. Mobs can have correct textures, random textures, or be completely invisible. Inventory is as badly messed up as the title screen. 

Screenshots without the overlay on a quarter of the screen are taken after pressing F1 to disable the GUI.

Version selector won't let me list all the snapshots. I have tested on 21w10a, 21w11a, 21w14a, 21w18a, 21w20a. It effects them all.