The same model is imported into different versions, why is it very different?

No problem after the introduction of the version model before 4.19!However, after 4.20, the same model will be broken and blackened (normally inverted).!alt text

I can’t upload it because the model attachment is bigger.

I have no definite answer, but:
Are the import options the same in both versions?
If you import Normals (or Normals and Tangents) you might want to check your mesh for inverted normals.

Of course, the settings I imported are definitely the same.

Ok, I found the problem, the low version does not need to generate the light uv, the high version has to be checked or it will break!