I noticed this in b2 as well. I have a couple planets that I cannot improve via terraforming construction. Every time (for these two planets) I choose to build one of the terraforming-like improvements (Soil Engineering, Planetary Soil Upgrade, Terraforming), the yellow site selection shifts to the colony hub and won't let me build. I have a save queued to one of the planets (idle planet), but the save file is massive (playing an insane sized galaxy). Any way to upload this?