I completed the top piece of the great monument two times with the same dupe and each time the game crashed immediately after it finished. I left the bottom and middle pieces the same for those two crashes. I tried a third time after switching out the two pieces for different designs and a different dupe and it still crashed. The picture is the first design I tried it with. It was right next to the teleportation POI and close to the top of my map, but not past the space abyssalite layer.
Build bottom and middle of great monument. Attempt to build the top piece and it crashes.