IKRetargeting Skeletal Mesh Does Not Update Virtual Bones

Occurs 5/5 times.

Regression does not occur: UE5Manny Skeletons are new to UE5.0 

Repro Steps:

1. Create a TPS blank project.
2. Open the UE4 SK_Mannequin in the /Mannequin_UE4/Meshes directory.
3. Create several virtual bones - 1) from root to foot_l and 2) from foot_l to pelvis.
4. Select the Jog_Fwd animation and see the animation tracking with the SK_Mannequin.
5. Right click on the Jog_Fwd animation and Retarget the Animation in the IK Retargeter from RTG_UE4Manny_UE5Manny.

Expected: The Virtual Bones track with the animation as occurred with the UE4 SK_Mannequin. 

Actual: The Virtual Bones are not updating and in some cases are removed.