Vertical animations and crawling animations do not work well.

[ishax-kos]

Trying to import climbing animations results in the character climbing in place.

[jasoleun]

EIREXE's fork of enziop's Mixamo Converter add-on applies motion on the vertical axis for the root bone, however it hasn't been updated to work with later versions of Blender. I submitted a pull request with the latest changes for it to work. I've tested it and it works with Blender 4.0.2.