I have encountered the same problem. Here is my solution.
- Find your metahuman SKM_YourName_BodyMesh
- Copy everything about LOD Setting to your Clothes SKM, like number of LODs, LODSettings.
- Generate LODs for your SKM.
- Setting LODSync Component at “Components to Sync”" and “Custom LODMapping”.
- Setting Change LOD setting command in game to check result.
Picture for Step2:
Picture for Step4:
Command for Step 5: r.ForceLOD 4
I consider we should Sync LOD with Metahuman accompanied by the reduction of the same bones, to solve this problem.

