Matte Shadow Alpha doesn't work with Matte Object casting shadows

[Moriah]

Simple scene, sphere, ground and a light. Put the ground in matte object with shadows and alpha enabled. Put the sphere in matte object too, it doesn't cast any shadows in the alpha. Take it out of matte object and it works as intended. I have to use "non visible to camera". Fortunately i don't have to cut out the object, if i did i would have an issue here.

Max 2015 SP3, Vray 3.35.01

[tashko.zashev]

Uncheck No GI on other mattes and should be fine.