@ Yeah a lot of thing have changed in SceneProxy since 4.19 , but the process is more simple than before !
I don’t really work with it , I’ve added some features last year ( Asset drop , Collision support , Converting to StaticMesh, default material , some details customization …) but Mike has already merged them .
EDIT : Just here is the official thread [PLUGIN] OpenStreetMap importer - Game Development - Epic Developer Community Forums