I've got three of these connected to dryatek 3910. When I do changes on the root and tell it to sync with the other mesh devices it only syncs the wireless one and not the wired one.
No errors in the log files and the wired unit is shown on the mesh root as a node
Anyone else had this. No great show stopper but slightly annoying.

I've got a 3912s and 4 x AP906 (a wired root node, 2 wireless nodes and another wired node) and things seem to sync for me ok; I was just moving them to a new VigorConnect server and only updated the TR-069 settings on the root node but those were reflected in the other 3 nodes - wireless and wired.
Not exactly your situation/devices and given what I recently discovered about apparent lack of common code it may not be relevent.
If there's any particular value/field you're having problems with, I can (probably) try it on my setup here.

It's just a minor annoyance so can live with it.
It was adding devices to access control list. The wireless one picked it up the wired one didn't