Not really what I would call a bug, more an un-intended change perhaps? As being listed in the release notes, tends to make one think that it is meant to be accessed. A new feature announced in b13 (taken from the Release notes): Cloud build: Added new API: AssetDatabase.ImportPackageImmediately. This is the synchronous version of AssetDatabase.ImportPackage. Then in b14, it was changed from Public to Internal?