Namespaces are not removed when importing Skeletal Meshes from FBX, and breaks the importing of referenced Animations

Namespaces in skeletal mesh FBXs are coming in as prefixes to the bone name. This issue did not appear in 4.19.2 (CL-4033788), as seen in the attached picture.

This issue was reported and tested in 4.20 (CL-4212847). This issue was reproduced in Main 4.21 (CL-4221482)

1. Download the attached FBX file
2. Open the UE4 Editor and create a new blank project
3. Import CH_Character_rig.fbx
4. Open CH_Character_rig_Skeleton

Results: The name of each joint has the namespace as a prefix to the bone names "rig_"

Expected: Namespaces are removed from the name of the bone, "rig_root" should be "root".