I think that I know what you mean but I would not call this a bug. There is a pandoran structure but it is not supposed to be revealed this way. Telling more would be a spoiler, you will see
I also see this as a bug. If it’s not to be found before an event, it should not be found. Making it detectable but not interactable leads to user doubt.
Anyone else run into a situation where once the hidden colony is detected, you cannot attack any colonies anywhere? This happened on my last game and I was soooo close to actually finishing a game. Once the early November patch hit, I could no longer attack colonies. I had the hidden spot before on previous games, but I could still attack.