The same thing happened to me, but the problem was caused by a mod I had installed. So, if you’ve already cleared the cache and still don’t see the texture, it’s very likely that a mod you have installed is causing a conflict with this one. In my case, the mod that was causing the conflict was a Gavril MD-Series mod.
Something similar ish happened to me (doesn't seem to be related to the MT Series) in which the lights of the T-Series and MD-Series, and anything using those lights textures, would SOMETIMES have no texture, but sometimes they strangely would. I think it's some sort of mod conflict on my end, with my 700 mods lol
I believe it's the T-Series MTL mods and MD-Series MTL mods. I downloaded it from discord server. You can find link from Belasco LEOA Project mod. It's in the Mod Requirements list. You can flnd link in here in case you don't know what's the name of that mod. https://www.beamng.com/resources/belasco-leoa-project.34099/