Issue with missing tracks

[Claudius2k]

Recently applied several updates to Minimserver in the last week. Running the latest MinimServer 2.2 update 267 on Synology NAS using the Wiim Ultra and WiiM HomeV 3.4.6.25122220. When I search by artist for numerous artists when I select the artist no albums appear under those artists, only the artist name appears. It works on some and not others. The actual data appears to be physically intact and valid. I can access those albums directly via a music shared drive, they are visible there and they play fine. But they are missing when accessing through the Minimserver index. Could there be something wrong with the index?
I have tried reindexing, deleting the mcache files and rebuilding the index completely. Rebooting the WiiM.