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)
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".
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-62099 in the post.