Difference between "All Synced Photographs" and "Uploads"
While I've used (successfully) the Lightroom Classic sync for years, I've recently run across an issue where not all images are being synced, despite being flagged for syncronization.
Below is a screenshot of my (admittedly large) catalog and the Lightroom Sync tab of Preferences. There's an unexplainable 23,487 images which are not being synced. They are spread across multiple collections, multiple file types, and a number of them *have* previously been syncronized.

To date, I have:
- restarted sync
- removed non-sync images from sync list and then readded them
- clicked "delete all synced data"
- gone to Lightroom online and removed synced images there
- completely resynced the entire library
There is NO current sync activity, despite leaving this window open for some time.

The problem still exists and I'm not seeing any new images sync whatsoever. Does anyone have any ideas on how to resolve this?
