Try adding the release year to the movies (or just the new one as a test):
Blade Runner 2049 (2017).m4v
Adding the year helps Plex disambiguate when there are multiple potential matches. You will likely want Plex Dance Blade Runner 2049 after making the file name change.
Also, check the tags of the .m4v file to ensure there’s no title tag with bad information.
Finally, there’s some guidance in the naming and organization docs regarding how to include the TMDB id in the file name to further assist Plex with matching.
