Material Property Block doesn't work on particle system that emit mesh.

Hi,

I was trying to add more animation of material property to a particle system by setting material property blocks. The weird thing is: when using any billboard render mode, it works as expected. When using mesh, it will not work. I tried apply the material property block with Unity's built-in animation (which animates the material properties by property blocks), and apply the block with custom script. Both produce the same result.

Am I missing something or it is a bug?

 

Bug submitted. Case no. is 776143. A simple animation on particle system was used to demonstrate the issue.