My test library wasn’t migrated either. It was in fact a brand new library created expressly to test this, using all defaults in the advanced settings.
I added four movies to the library and ensured they were indeed matched (Fix Match present in the more menu, Unmatched filter in the library view empty). I then refreshed all metadata for the library, deleted all but Back to the Future’s files and directories from the library directory, and then performed a new scan. The results are what you see above; Back to the Future is still in the library normally, Ghost Busters and Top Gun show with trash indicators, and Real Genius is just gone.
I’d be very surprised if this is the expected behavior as well.
