The changes made for {T6799} have broken the migration of the group config because Kleopatra now looks in the wrong place for the old group config. Instead of looking in `%LOCALAPPDATA%` Kleopatra now looks in `%GNUPGHOME%/kleopatra` for the old group config (which is also the new location).
This happens only on Windows (because we use `%GNUPGHOME%/kleopatra` only on Windows).
To test this move `kleopatragroupsrc` from `%GNUPGHOME%/kleopatra` to `%LOCALAPPDATA%`. If migration works then Kleopatra will copy the group config file from `%LOCALAPPDATA%` to `%GNUPGHOME%/kleopatra`.