So after completing the Darn Kids quest, I receive the unique Whapster system improvement. Not noticing that it was limited to one copy, I queued it on multiple systems and it ended up completed on the wrong one. I scrapped the one I created and started cancelling the other Whapsters in system queues (in that order), only to find out it wasn't available anymore! Nor did construction resume on the system that still had the upgrade queued on the turn following the scrapping. I cancelled them all, but to no avail.


Hope this helps, good luck squashing them bugs!