To reproduce:
1. Open attached project;
2. Run asdf scene;
3. Press on Plane and see that is White (should be red);
4. Open shader _0;
5. Comment line Blend One Zero and un-comment Blend 0;1;2;3 One Zero; ( Notice that the Plate is red);
6. Open shader_0 again and switch back to the single line Blend;

Actual result: The plane is white when using Blend One Zero with ColorMask RGBA 3
Expected result: Using Blend One Zero with ColorMask RGBA 3 should give material color to the Game Object.

Reproduced in : 5.5.2p2; 5.5.2p3;5.6.0f2; 2017.1.0a4

Updated reproducible in: 2017.1.2f1, 2017.2.0f2, 2017.3.0b3

Note: if you change ColorMask 0 0 to ColorMask RGBA 0 and combine with Blend One Zero the Plane has red material.