I ran into this bug as well. I shift+clicked a blueprint over some water and it took a long time for any robots to start bringing landfill. I definitely had enough landfill in the network and the landfill was in the roboport network range. This is on an unmodded playthrough. I built a roboport and t...

When downloading updates to my mods, I noticed I got into a state where the window said "All mods are up to date" , even though a mod was still downloading. See attached picture.