Translation Retargetting is messed up when using Remove Unused Bones from Skeleton

Translation Retargetting is messed up when using Remove Unused Bones from Skeleton

1. Open Content Examples
2. Find the M_MALE_Base_Skeleton
3. Scroll down to upperarm_twist_01_l
4. Enable Show Advanced Options
5. Change the Translation Retargetting to Animation
6. Go to Asset>Remove Unused Bones from Skeleton, select yes, then OK

Result: Either another bone has Animation or the entire Heirarchy above upperarm_twist_01_l is now set to Animation
Expected: Just the one bone still has Animation set