I tested on two new projects with exactly the same results.
Mobile/Tablet
Scalable 2D/3D
No Starter Content
Desktop/Console
Maximum Quality
No Starter Content
Once created, I selected Mobile Preview and typed ‘viewmode shadercomplexity’. Everything is red.
I then deleted everything in the scene except the floor, created a new material with a simple uniform color of ‘0.5’ to diffuse, compiled and applied the new material to the floor, rebuilt level, and played game via mobile preview. Same result as my first post.
I didn’t change any project or world settings. Everything is default.
Thanks!