UPDATED: Scan For Double Entries v4.1
Universal, for macOS 11 and later only. This applet will scan your Music library for pairs of track entries that--very strangely--point to the same file and then copy those tracks to a discrete playlist for further examination; presumably you'll want to remove one of the faux pair tracks without Trashing the single associated file.
More about this issue is here.
Latest version:
- Officially compiled as Universal
- Commensurate improvements for M1 Macs
More information for Scan For Double Entries v4.1 and download link is here.