Server Version#: Version 1.32.6.7557
Player Version#: Any
I have set up some album and artist collections and noticed that over time artists were disappearing from the artist collections (nothing disappearing from album collections). It seems this problem/bug has been around for some years, and there was a hint that this was related to metadata refresh, and this is absolutely the case.
When I tell the music library to refresh all metadata, all artists that have metadata “in the cloud” are removed from artist collections.
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My library is set to have a periodic scan. (daily). Note that not all artists disappear on the first day, but they seem to disappear in dribs and drabs over time.
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Scan was previously set to empty trash immediately after scan, but disabling this has no effect - the artists still disappear.
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Media files are on the filesystem of the Synology server, so never become unavailable.
Edit: Note that album collections are not affected in this way.