(I hate my code)
In all seriousness, ContentManagement, while it was a good idea, needs to be refactored to be modified to use BepInPlugins instead of obtaining the assembly via the calling method.
Using the assembly causes issues as it can sometimes create unecesary content packs. Or overall unintended behaviour
This rectification should be done in a clean way ideally to avoid mods breaking, which could be difficult.
The other option of course, is to do nothing and completely axe ContentPack frameworks from R2API once Seekers of The Storm releases, and let modders properly use IContentPackProvider.