Private "Someone" channels after migration

well some more problems with these "someone"s.
We do have users that had the persons under their favorite channels and now they have these “someone” channels that cannot be removed.
CloseUnusedDirectMessages does only help for the someones in the direct messages section.
Is there also a solution for the favorite channels?

Or will the problem itself be fixed in a newer release so that we can even set CloseUnusedDirectMessages back to false?