SS 3in1 3.4.5a All Add-ons. WSF + WS+ Loads of other mods. I get an upgrade notification marker and I go to the plot in question. If instead of upgrading, I change the building to something else the upgrade notification stays on the plot until the new building reaches it next level. As I am using realistic building times that can be a couple of days. Not a critical bug and I can easily live with but can be annoying when I "do the upgrade rounds".