Addressables doesn't load newly added assets

I have a tool that parses spreadsheets and creates ScriptableObject assets from them. For some reason, Addressables.LoadAssetsAsync fails to load these newly added assets, even though the assets show up in Addressables Groups.

When I enter play mode, something seems to be happening that causes these new assets to be loaded. What do I need to do to get them to load without having to enter play mode? I tried a variety of things such as clearing caches and updating catalogs, but nothing seems to work.