Reproduction steps:
1. Create new project.
2. Import Asset package (bug_report_particle_mesh_renderer_shape.unitypackage)
3. Open scene "particle mesh renderer shape bug report".
4. Press play.

Expected result: Particle color will be the same as object they are emitting from.
Actual result: Particle use default mesh color

Note: This behavior is expected because Texture colors are different from Vertex colors and so this option ignore them.

Expected change: In "Use Mesh Colors" tooltip add information that Texture colors are ignored. Some users can not tell the difference between Texture colors and Vertex colors, so they might find this tool working improperly.