I recently upgraded our addressables package from 1.7.5 to 1.8.3 but noticed the m_InternalIds changed in the generated catalog_BuildScriptFastMode.json to exclude file extensions for addressables in our Resources/* dirs. This breaks loading the addressables at runtime since AssetDatabaseProvider calls AssetDatabase.LoadAssetAtPath() which requires the full path - including file extension.
I believe this bug was introduced in the change near line 160 in BuildScriptFastMode.cs (see GatherAssetsForFolder)
I think I experienced the same bug after upgrading from 1.3.8.
There was one part in the project where we were loading a few things from the built-in group. It stopped working as soon as we updated addressables.
A temporary fix was to move the data to a normal addressables group, but it took my by surprise.
I even thought maybe I had misunderstood how to use the system. At least now I know somebody else had the same problem.
Thanks for flagging, @jeffr0tull - if you haven’t, please submit a bug report for us. I’ll also forward this to the time, and pass along any insight they have.
Getting this too. I’ve worked around it modifying a local copy of the Addressables package. Would like a fix as it is currently the only reason I’ve made a local copy of the package.