For those that may have reached this thread because of:
“Can’t connect to Roon Search” message when trying to search
Whole albums won’t load, only individual songs on albums
‘View complete album’ command missing
Favorites from Qobuz / Tidal aren’t syncing
Metadata images are blank or sparse
All of these happened to me on a new Roon server build on Linux. I thought the db was corrupted. I noticed the router had IPv6 DHCP leases. Once IPv6 was disabled on the device all of the above problems disappeared immediately.
I hope this helps someone