Ah, that's no good! I'll look into this asap

I think it's partially implemented. You can use the 2D sprite preset, but I think it might not work correctly with UI masking/clipping

Thanks a bunch!

Does it happen in 5.5.0 as well?

Make sure you download it though Unity 5.5

This has now been fixed in 1.33!

I was going to look into it the last weekend, but didn't find the time to fix it. It'll most likely be fixed this coming Saturday

It seems like if you want to animate every frame, using MaterialPropertyBlock is faster, but if you only want to assign it once, material.color is faster. Regardless, the attribute made no difference in my tests

I'm starting to suspect I've written some sort of quantum serialization

(Interestingly enough, adding the attribute does nothing, and using material.color seems to render faster than both. I'm not quite sure what's going on to be honest)