Operating system: Darwin-20.3.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 5500M OpenGL Engine ATI Technologies Inc. 4.1 ATI-4.2.15
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: rB02948a2cab44
Short description of error
If a blender scene is added in the VSE, the shading mode is respected for 3D objects vertex colors but not for GP objects
Exact steps for others to reproduce the error
Open the attached blender file and switch between the "3D" scene and "EDIT" scene. In the 3d viewport of 3D scene both the cube and the grease pencil stroke are shaded correctly, in the VSE EDIT scene the cube shows the correct vertex colors and the GP is flat shaded without colors.
Side Note: using the "override scene settings" and forcing the workbench engine on the EDIT scene to respect vertex color and flat shade, makes no difference.