Have you tried adding the source id to the filename rather than just the enclosing directory/folder? Like this:
Be My Master (2018) {tmdb-592742}\Be My Master (2018) {tmdb-592742} [1080p x265 AAC].mkv
I’m not sure but I think I remember during the development of the new movie scanner that it pays heavy attention to the actual filename rather than the enclosing directory.
You might want to move the directories/files out of directories that Plex is monitoring, do the Plex Dance and then try adding them back one by one.
Good Luck,
Chris