Server = 7.2.2.
Android = 8.0.5.

Total Songs = 77k
Mixable = 72k (normal)

Database Status = 37k

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Nothing in my collection has changed (i.e. no converting formats, etc) except maybe files paths (because of organizing my collection). But, the recent update is now reporting less than my total. Full albums that were there before are not showing up.

Is there something I probably have to delete and rescan my folder path? (I hope not, it takes 2 days)
Or is this something that could be an easier fix?

Under Muzecast folder there is a folder called: "Libraries\My Library".

That folder contains small files for mixer with extension "*.mp3" which has just metadata and "*.json" which has data to be updated in database.
From error logs I see that a lot of "*.json" files are missing or were deleted in that folder.
To reconcile these files you can do one of these things:
1. Delete files named: index.txt, count.txt, and index.txt.all from folder Libraries\My Library and restart Folder Scan.

or

2. Delete the whole folder Libraries\My Library and restart Folder Scan.

Folder Scan in either case should not take as much time as it took at the beginning, because most of the data will be restored from data stored in database.

Error logs do not show any information why "*.json" files are missing. If they were deleted by external action, Muzecast would not have this information, but I will continue to review more logs to see if I find any information if JSON file were saved and then deleted or just failed to be saved.