How to reproduce:
1. Open User's attached "SurfaceShaderUsePassBug.zip" project ("Switch target" if prompted)
2. Load "SampleScene" found in the Scenes folder
3. Enter the Play mode
4. Observe four big squares in the middle (green and yellow with green squares) for a couple of seconds

Expected result: all squares stay lit (as visible in Scene mode) as Camera moves Z-axis
Actual result: middle four squares (Mesh objects) do not stay lit as Camera moves Z-axis

Reproduced in: 2018.4.11f1, 2019.2.10f1, 2019.3.0b7, 2020.1.0a9
Could not reproduce in: 2017.4.33f1 ("Unknown shader channel count" console error)

Notes:
- the issue is visible only in the Play mode
- not reproduced with Sprite Renderer object instead of a Mesh object
- reproduced with newly created default Unlit Shader (User uses a custom Unlit Shader)
- in versions 2019.3.0b7 and above Quad Mesh appears to stay lit, while Simple Generated Mesh still encounters this issue
- one workaround would be to add "DisableBatching"="True" tag to the shader
- another workaround would be to either disable Batching or use only Dynamic batching through Project settings -> Player