Most Material Instances render as the World Grid Material when placed on a Skeletal Mesh

When adding certain Material Instances to a Skeletal Mesh, the Material Instance break and renders as the World Grid Material. This persists in the project and the Material Instance cannot be used until the user restarts the project. Most of the Material Instances I tested have this problem, but I noticed that MI_Glass_Windshield_SunCover_Int works correctly. 

This does not occur when placing the Material Instance on a Static Mesh. This also doesn't occur with Materials being used on Skeletal Meshes. Tested in //UE4/Release-4.25 @ CL 14469661 and this does not occur so marking as a Regression.

1. Create a Third Person Template project
2. Add the Automotive Materials pack from the Marketplace into the project
3. Drag a SK_Mannequin into the level
4. Add a Material Instance such as MI_Rubber_Shiny or MI_CarbonFiber to the SK_Mannequin

RESULT:

The Material Instance renders as the World Grid Material

EXPECTED:

The Material Instance would render properly when set to a skeletal mesh