[Bug][ots-2.0] Model textures are not rendering correctly

[AlephZHAO]

For the same .obj file, the legacy version can automatically map textures based on regions, allowing normal texturing and rendering of the model. However, with the latest second-generation version, after uploading both .obj and .mtl files, solid-color filled areas (i.e., regions not correctly textured) still appear.
The uploaded files are identical. For the first generation, I manually mapped textures according to the .mtl file. For the second generation, after uploading the .mtl, simply upload the Tex files as required.
See the link below for the demo file.

https://files.catbox.moe/uqyvfz.zip

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