Bug Updating from 2020.1.2f1 to 2020.3.14f1 (LTS) bugged my materials?

An image is worth 1000 words.

The mipmaps are inverted or something? From afar the textures work just fine, but if the game camera or scene camera gets close, the textures go all single color and shading gets broken.
The shader is the Standard shader.

 

Update: This is somehow related to the mesh importer. It throws a ton of errors and warnings that the 2020.1 version does not... exporting the .blend to fbx 'fixes' the issue, except the part that I have to 're-set' all meshes now, so at least there is a workaround.