The day I upgraded to version 13.3 (5.2.23.24), only the photos prior to that date are synced. All new photos and edits are not synced. The "migrating sync data" has been running since the update, with no end in sight.
I had the same issue. I'm on Windows, but maybe you could try my solution. Go to settings, Lightroom Sync. There, hold alt (option on Mac?) which makes three secret menu options appear. Choose rebuild sync data.
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