[REDACTED]
The other wall that’s not grey is not generated, right? If it’s using the same material it tells you that the issue is with generating the mesh and applying a material to it, not with the material itself.
What material / shader are you using? Custom shaders may not always work on WebGL.
WebGL v1 or v2?
Did you try other browsers?
Try replicating the issue in a new, empty project just generating a mesh using the same code (as much as possible) as you currently have.
I bet this is going to be a hall configurator, for storage, production, agriculture, etc. We made one too over the last couple years. 
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