Can't see Masked Materials on device launch

Hi, I m Daniel from Italy.
I m triyng to setting up a scene for a racing game for android…
but when I try a test launch on my device I can’t see the masked material I used for folliage on trees.
I tried with other meshes and nothing changes. I think there’s another way for set that kind of material.

Thanks and sorry for my bad English

no more problem in release 4.4