Reproduction steps:
1. Open the attached project.
2. Open and play the 'Test' scene.
3. Select 'Beyblade1 > Hanger' game object.
4. Change X Motion, Y Motion, Z Motion, Angular X Motion, Angular Y Motion and Angular Z Motion to 'Free' in the Inspector.
- Notice, that object will drop down.
5. Stop the scene.
6. Select 'Beyblade1' game object and change 'Spin Speed' value from 4000 to 400.
7. Play the scene.
- The script will change Motion and Angular Motion to 'Free' when 'Spin Speed' drops down from 400 to 300.
8. Select 'Beyblade1 > Hanger' game object.
- Motion and Angular Motion values are set to 'Free', but the object doesn't drop down.

Actual behavior (Screenshots attached):
- Motion and Angular Motion doesn't update.

Workaround:
- Move the object.

Reproduced with:
2017.1.2p3, 2017.2.0p2, 2017.3.0b10, 2018.1.0a5