Magika ignores the -m commandline option in some instances

[hldr4]

magika file.bin
file.bin: Unknown binary data (unknown) [Low-confidence model best-guess: ISO 9660 CD-ROM filesystem data (archive), score=83]

yeilds the exact same thing as

magika -m high-confidence file.bin
file.bin: Unknown binary data (unknown) [Low-confidence model best-guess: ISO 9660 CD-ROM filesystem data (archive), score=83]

But setting it to medium-confidence gives a slightly different output. Is it a design choice to ignore the high-confidence option when it's likely to fail? Or a bug?