Creating a base node for an upgraded building does not create a node for the upgrade

[Crimsonum]

Buildings with upgrades require two nodes on the same cell: one for the parent building, and one for the upgrade. WAE currently has the same limitation as FinalSun/Alert where creating a node from an upgraded building only places a node for the parent building, not the upgrade.

[Rampastring]

It is debatable what behaviour is desirable here.