Root Bone Animation Retargeting Scale

Is it possible to properly (no foot-sliding) retarget root-motion animations to skeletons of different Scale/size?

When I adjust the Pose of the Source Skeleton (root-bone Scaled down to 0.5) to match the Target’s half size, the retargeted animation root-bone ends up scaled up to 2. Instead, the root-bone ‘animation’ should be scaled down by half and the root-bone itself should remain as 1.

It seems that no mater what Translation Retargeting settings do I use, the Retarget Anim system scales the root bone UP instead of scaling the root animation DOWN.

The comments seem to mention a bug and all the examples show either in-place retarget, or root-motion retarget to a same size skeleton.