Audio file names bug on check media (reported as missing and unused at the same time)

The following bug affects both my Anki 2.1.22 and 2.1.33 version, even if I start them with no addons active:

when I use the Check Media function, some audio files are reported both in the “referenced by cards, but not found in the media folder” and in the “The following files were found in the media folder, but do not appear to be used on any cards” sections, at the same time.
The files are actually there. If I click on delete ‘unused’ media I lose them.

I believe this is due to the fact that they all contain the & character in their file name
e.g.: “15 Aortic, Sys Mur & Absent S2, Sitting, Bell”, “11 Apex, S4 & Mid Sys Mur, LLD, Bell”.
Renaming them and removing the & character solves the problem, and no other approach seems to work.

Was/is this a known problem?

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