This question was originally (and incorrectly) migrated to WebApps (now deleted, after closing it). Since the question was offtopic, I closed it there and as a result the migration on Super User was rejected.
I then proceeded to migrate it to WordPress - and now, even though the question is open on WordPress - on Super User, the revision history mentions that the migration to WordPress is rejected & hence doesn't show as "migrated".
What's going here?
(Note that the revision history shows migration to WordPress twice - that's because it was migrated by random first, but the question on Super User was shown as closed as offtopic instead of migrated - same issue as above.)