It's still here, in MC22, and we wouldn't want it to show up in MC23.
I have the exact same scenario as the original post:
I recently had to rebuild my media PC with a fresh reinstall of Windows 10 due to SSD failure.
Next step was reinstalling MC, and importing all my music files. All of those reside on a NAS, in various folders by file type or origin, e.g. \FLAC for ripped flac files, and \HDdownloads\HDtracks for everything downloaded from HDtracks. \MP3Downloads\StoreName for all mp3s from a particular download store, e.g. amazon or emusic... and a few more directories along the same lines. Below those folders I consistently maintain the same hierarchy: \Artist\AlbumName
Two things happened after the rebuild: (may not be related to the rebuild, though)
1. I ripped a number of CDs, moved the flac files to the respective directory on the NAS, and after running the import all but one of the albums had imported. I ran import again, and that missing album was still skipped, even though it was in the correct Artist subfolder, from which all other albums had been successfully imported in the past. No excessively long path names, no special characters, no Windows permission issues. I attempted to run the import multiple times over the following few days, with no success. Note that I was able to play all of the files from that missing album by launching them from their directory, playing them with MC. Then, a week later I re-ripped the same album and ran the MC import again. This time the import worked. Weird!
2. A slightly different issue, with the same result: On another occasion I downloaded a few albums from from HDtracks. I do this a few times a month. (My one addiction.) Those downloads are moved to the respective folder on the NAS right after completion. It always worked in the past, including a week earlier when I downloaded a couple of albums. But this time, none of the albums from the most recent download were picked up by MC while running the import. Numerous attempts were unsuccessful. I checked the import settings, and low and behold the HDdownloads\HDtracks folder had disappeared from the designated downloads sources.
Those download settings for me are 'set and forget', i.e. I configure that during MC installation, and never mess with it again, since my NAS setup is static. Nobody else has the permissions to use my Windows account, the only one with access to the respective source folders on the NAS. (Other household members don't care about resolution or compression - they only get to access the \MP3 folder on the NAS.
So I added that folder back, and of course everything imported now. I've observed the same thing once before, as one of the source folders magically disappeared from the import settings. Obviously, once you notice that, it's an easy fix.
What the heck could cause those import setting to drop one of the designated source folders?
Note: nothing had changed on the NAS. None of the NAS' top level folders, e.g. FileType\StoreName, or \FileFormat were ever removed, replaced, moved around, or corrupted at any time. The only regular changes are additions of \Album or \Artist folders as I acquire new albums. There's really no reason MC should, on its own, decide to drop import sources from its settings randomly. Are there any known conditions that can cause this, e.g. changing certain other MC settings?
Thanks, any input is appreciated!