Make skeletal mesh custom LOD coexist with LODSettings asset

Create a skeletalmesh LODSettings asset by using an existing skeletalmesh

Import a skeletal mesh

open the skeletalmesh editor, Add the LODSettings and hit regenerate button under the LOD Settings category

reimport one of the LOD created by the LOD Settings has a custom LOD (you can use the same fbx you use for the base skeletal mesh LOD)

RESULT: The imported LOD is imported but the LODSettings is overriding it with the settings so you do not see the imported LOD

EXPECTED: The LODSettings stay and the custom LOD is overriding the generated LOD