@connor I removed all physical files and folders that might be problematic for Roon’s scanning, but the blue circle kept spinning. Now that you showed me what to look for in the logs, I saw I/O failures for tracks that were being analyzed. Turns out that the file names were in an *.m3u playlist but the files themselves don’t exist because they were moved (by SongKong?).
I turned off importing playlists and now the blue spinning circle no longer appears.
I expect the analysis retry queue will shrink with the next scheduled maintenance. Thanks for the support and very helpful diagnosis!