When i spawn a car in creative mode from the boxes, nor the cars or the boxes have textures, version 1.16.1

I'm having this problem too. the Models and textures are Missing (Black/Purple) but the cars work.
Should be fixed. Version 1.16.1

Remove optifine if you're playing with it, I believe it's been mentioned multiple times that optifine breaks the textures.

i was just about to comment that, removing optifine fixed it lol