The number of relation seem to be the root of the problem, perhaps you don't have enough relation to prevent sync to happen almost correctly until audio kick in, let's hope an engineer pass by 😅.
Are you sure it's really syncing ? In my case after a backup restore sync start, and I can see it start on another device, but never finish (probably 10.000+ records with lots of relationships with them)
AzSiAz
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