1. What happened

Using a script that enforce model import as Humanoid, if the model doesn't have animation it is still imported with NoAnimation type instead.
Right clicking on it after the first import and doing re-import will fix it.

2. How we can reproduce it using the example you attached
- Open the project and import the Dude.fbx file in it.
- Select the asset and go to the Animation panel of the importer.

Actual result : Animation type is none
Expected: Animation type is Human because of the AssetPostprocessor script in the project.