Everything breaks for me as well the moment the setting "Access Intranet = Disabled" [ Note: "Sync to AiMesh Node = All" ]
All devices connected to the nodes (not the main router) will not work.
Sync is already set to All. Clients will get a valid IP (IP from your main network range) and work from the nodes Only if the Access to Intranet is set to enabled. The moment you turn the Access to Intranet to Disabled only clients near the main router will work and get a Guest network IP. All...
I have exactly the same issue. Reseting everything etc. makes no difference. Of course i do not want guests to be able to access my house cabled network.