When attempting to reproduce this, I was able to find that it seemingly occurs when you'd overwrite an existing pipe connection with the undergrounds facing another direction? I've attached two videos of the attempts to hopefully clarify this. I can't quite classify what causes it to crash or not, given that it doesn't always seem to crash when showing the blueprints hovering over. I haven't clicked at any point in here, and one thing I am wondering is if the focus is required to be on another window for it to work (hence having the screenshots / videos as the main focus)And the game crashed as I pressed R to rotate the 'L' section of pipes - it didn't occur when I pressed it with just a single line of the underground pipe segments, maybe it's to do with the copy area including the ship?
I expected the pipe segments to rotate so I could place them over the preexisting ones to 'fill out' the corners a little like they were on the top left, but this time on the bottom left.
Apologies for the inconvenience!