Thank you for following up and for the documentation link! I made some progress, made similar edits as you suggested and the Sync fn rejected doc logs became less frequent. It looks like I ran into the same issue I had a long time ago: SG rejects newly created document with document ID of deleted document: Channel access missing
I checked - on CBL 1.4 - the document and database classes. They don’t offer such a method. But interesting nonetheless.
Hopefully I can follow up tomorrow and share my solution!
And yes, all documents have a channels property.