TL;DR
Add the "out of network" warning triangle for any entity where a logistics connection has been configured (or, alternatively, when configuring logistics connections for entities that are out of network, make this obvious inside the logistics connection configuration panel)What ?
Logistics Chests that are not in the logistics network get a flashing warning triangle to show you that they're not going to function. This is great.I was just digging out my first game where my roboport coverage was a bit more al dente, and spent ages trying to work out why I wasn't manufacturing underground belts in my hub, and eventually realised that the output inserter was just outside of logistics network coverage. There is currently no indication that you've messed up here either via the flashing "no connection" warning on the logistics-connection-enabled entity, or within the configuration panel for the logistics connection.