I had a .obj model of a car body I created wth three submeshes and a material for each. After some errors (unrelated to the model) popped up in my assets, I decided to reimport all assets. The errors were fixed, however, the car model's submeshes were destroyed. Instead, all three submeshes were merged into a single mesh that attempted to use three materials at the same time. How can I fix this, and why did it happen?
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