Not sure if this gives you any extra clues, but I saw one of my files with a synchronisation icon a few minutes ago. It's now displayed as updated again, but the file hasn't been updated at all.
If this is going to remain a problem, I would look into providing a backup feature of forcing synchronisation of manual files. Whatever happens, something needs to be done because Ubuntu is making a big thing of this unique feature, and for it to fail to work in a LTS release does not look good.
Not sure if this gives you any extra clues, but I saw one of my files with a synchronisation icon a few minutes ago. It's now displayed as updated again, but the file hasn't been updated at all.
If this is going to remain a problem, I would look into providing a backup feature of forcing synchronisation of manual files. Whatever happens, something needs to be done because Ubuntu is making a big thing of this unique feature, and for it to fail to work in a LTS release does not look good.