When Retargeting Animation, Mesh Set as Preview that Shares Skeleton Isn't Kept

When a preview mesh is set inside the skeleton(see attached screenshot) and saved and an animation retargeted to that skeleton, the preview mesh you changed it to is not displayed on the animation.
Thumbnail is also incorrect
Does not occur/anim is based off of what is set in the skeleton in 4.18.3 but in this version the thumbnail did no update correctly

1. Open attached project
2. Open skeleton
3. Change the preview mesh to suzannehat by going to Preview Scene Settings < Mesh < Preview Mesh < Apply
4. Go to any animation and Right click < Retarget anim assets < Duplicate anim assets and retarget
5. Select the skeleton in which you just changed the preview asset(to suzanne_Skeleton)
6. Retarget
7. See the animation's thumbnail
8. Open the animation and see the preview mesh does not default to the what you changed it to in the skeleton(suzannehat) instead it displays suzanne(mesh)

Expected: Animation defaults to display the mesh that is currently set in the skeleton when it is retargeted and the preview does not need to be changed twice

Results: Animation defaults to the other preview mesh and disregards which on is set in the skeleton when retargeted