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Here are some steps to prevent Mixamo animations from malfunctioning when applying root motion in Unity:

1. In the Mixamo website, select the animation you want to use and choose "Download" as "FBX for Unity."
2. Import the downloaded file into Unity by dragging it into the Assets folder.
3. On the Import Settings window, enable "Import Motion" and "Add Root Motion."
4. Create an Animator Controller and assign it to the model.
5. Add a Motion Behavior script to the model game object.
6. In the Motion Behavior script, change the Update Method to "Animate Physics."

By following these steps, the Mixamo animation should work properly with root motion in Unity. However, keep in mind that not all Mixamo animations are designed to work with root motion, and some may still malfunction.