Got an update on this, the MiloMod does work to fix the issue. You can only use it on some RBN DLC unfortunately. The good news is I only have like 10 RBN songs so I’m not missing out on much. It does fix all the custom songs so that is a big relief.
You are about to leave Rhythm Gaming World and access the external songs DB. While no song or file sold for commercially available videogames is hosted there and only fan generated content is allowed, Rhythm Gaming World has no direct control over the database and no files are hosted here. Alright, we had to made you aware of this, now you can visit the database!