Outline shader doesn't work on animated sprites

[skeddles]

I tried to add the outline shader to coins, but it got weirdly stretched too wide.

It seems to be because it's animated. I tried making the animation 16x16 and 32x32, and it still got stretched.
The outline shader does seem to work on sprites of different sizes, as long as they aren't animated.

Not sure what could be causing it, but enabling the shader is disabled on the coin for now.