not entirely sure how it happened, but I got to a point where the game started messing up my planets in all my universes, some are basically bigger planets that turned into smaller ones, and this one was a 87x87 agri base that somehow got turned into this.
The only guess I have is that it might be related to me having too many buildings? There were no crashes or me closing the game while it was saving, so it got corrupted by something in-game.
(I do have high time speed, so that also sometimes messes up other things like, again, ships getting forever-stuck in travel if you max out the speed slider to 0 seconds travel time between planets in a system on a high time speed with all the travel speedup researches, again my guess it that the division gets a float error and ends up ever so slightly negative, so even though it shows you 0 seconds left it never actually reaches exactly 0 which you seem to compare to when checking if it arrived yet)