If a bug is filed against a project that does not use Launchpad for bugtracking, with a bugwatch of "Unknown" importance, and it is then refiled against a project that does use Launchpad for bugtracking, the "Unknown" importance should change to "Undecided".
If a bug is filed against a project that does not use Launchpad for bugtracking, with a bugwatch of "Unknown" importance, and it is then refiled against a project that does use Launchpad for bugtracking, the "Unknown" importance should change to "Undecided".