In my little testing game, which can be found here, all of the characters are rendered in “3D” using the traditional stamping method. When the sprites are small, like they are in the project, the eyes blink when they shouldn't. When I was messing around trying to fix this, I realized that the eyes didn't blink when the characters were larger.

Does anyone know why this is? Or how it can be fixed?
Or is it just a bug in Scratch 2.0?

It's probably a bug. There was a similar problem mentioned somewhere where sprites or objects seem to magically disappear when they were shrunk.

Weird we need to file this one. Thanks for the example!