Animating image with ReverseMask not working (Unity 2017.4.2f2)

[aerionTech]

When animating the ReverseMask image by changing its width/height, it animates in the scene tab properly but not in the game tab. See this video:

https://drive.google.com/file/d/1smLNo_Heiz-UhJ3i_8Np-BhaTpBo5X3Z/view?usp=sharing

When not animating it, it works fine:

Here's an example project: CircleFadeTest.zip