Root Motion Node is not saved when applying changes

Reproduction steps:
1. Open the user's attached project
2. Select Assets > GrabSelfInflatingBag.fbx model
3. In the Inspector > Rig make "Animation Type" into "Humanoid"
4. Make "Avatar Definition" into "Copy From Other Avatar"
5. Select Source and select an available model
6. In Inspector > Animation > Motion make "Root Motion Node" into "ROOT_character"
7. Apply changes and observe Preview
8. Select anything in Editor and reselect GrabSelfInflatingBag.fbx model
9. Observe "Root Motion Node" and Preview

Expected result: "Root Motion Node" is "ROOT_character"
Actual result: "Root Motion Node" is "<None>"

Reproduced with: 2019.4.39f1, 2020.3.35f1, 2021.3.3f1, 2022.1.2f1, 2022.2.0a15

Reproducible on: macOS 12.3.1 (Intel)

Notes:

• 2019.4.39f1, 2020.3.35f1, 2021.3.3f1, 2022.1.2f1 Model Preview is only visible when selecting editor and reselecting GrabSelfInflatingBag.fbx asset after changes are Applied