Alembic skeletal mesh custom LOD geo doesnt load

things look stupid but imported alembic as skeletal mesh (animated) refuses to load any custom LOD file throwing an error see pic
bandicam 2024-03-03 11-04-29-709
while custom LODs work just fine for the same alembic as static mesh
Exporting the lod file from 3ds max with the same object name in max

any idea whats missing here or looks like a bug ?