How to reproduce:

1. Open Repro project (please download from comment)
2. In the scene, there are 2 trees, each of them are using 2 separate shaders.
The only difference in the 2 shaders is the line "DisableBatching" = "True"

Actual Result:
Left tree's shader has the line "DisableBatching" = "True". It gives correct result which is green with brown trunks
Right tree's shader doesn't have this line. It gives dark grey

Expected Result:
Both trees should look the same, i.e. green with brown trunks

Note:
Please see repro.gif in comment: there are 5 ways to make the right tree look the same as left.

Reproducible: 2017.1.0b8, 5.6.2f1, 5.4.0b21, 5.3.5f1, 5.2.4f1.