i'm not sure if the bug is exclusive to my rendition of rocketcrazy's apollo 11 craft, but to see for yourself here's how to do it.
1. Transfer astronauts from the command service module into the lunar lander (in orbit preferably)
2. Go beyond 10 km from the command module
3. Once that's done, turn around and go back
4. Game freezes once you get <10km from the command module craft (if it's set as target, the command module will seemingly teleport either right next to your player-controlled craft or noclip with it and crash the game)
Here's a video to demonstrate: https://www.youtube.com/watch?v=_-Cz7qfWipY&feature=youtu.be