- Edited
I gotta say I agree with the iCloud sync synopsis there. It does work like magic until it doesn’t. I suggest maybe closing this issue of mine as ‘out of your control’ and I’ll chalk it down to Apple. I suspect (as has happened before with other iCloud sync issues) that it will randomly start working one day.
If there was a way for you to add some kind of force sync to the browser then I would encourage that, otherwise I think there is little you can do if it works in the majority of cases.