Steps to repro:

1. Open attached project and 't1' scene;
2. Open Frame Debugger (Window -> Frame Debugger);
3. Expand any event that renderers SpeedTree mesh (e.g. DepthPass.Job);
5. Select any draw call under this event (e.g. Draw Mesh Conifer_Desktop_LOD0);
6. Open Preview tab of Frame Debugger window;
7. Observe tree rendering.

Expected result:
SpeedTree mesh renders in white color and is consistent with mesh preview (see attached expected.png screenshot).

Actual result:
SpeedTree mesh is pink and corrupted (see attached actual.png screenshot).
Regression introduced in Unity 2017.1.0b2.

Notes:
- Reproducible in 2017.1.0b2;
- Not reproducible in 2017.1.0b1, 5.6.0p3, 5.6.0f3, 5.5.2p1;
- Reproducible on Windows 10 and OSX 10.12.3;
- Reproducible in both Editor and Standalone build;
- Reproducible only for SpeedTree models, not reproducible for simple primitive meshes.