Update Source button does not update the PoseAsset in Persona

Update Source button is not updating the PoseAsset that was created from the animation sequence.

1. Open QAGame in the editor
2. Right click on Run_AdditiveTracks in the content browser and create PoseAsset
3. Open Run_AdditiveTracks in Persona and pause the animation
4. Translate the upperarm_r bone away from the body
5. Click the Key button and then the Apply button in the toolbar
6. Double click on the previously created PoseAsset in the asset browser to open it
7. Click on the Update Source button under the Anim Asset Details panel
8. Double click on Pose_6

Result: Arm is not moved away from the body

Expected: Arm is moved away from the body

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