I just got the following:
I found a few comercial jump engines on Mars.
So I send a few freighters to pick them up and bring them to Earth, where all the shipyards are.
After flying back and forth, the jumpengines are still on Mars, while Earth shows 0 commercial jumpengines (obviously, they are too large to fit into the holds of one of my frighters)
Now to the bug: I can deconstruct the 0 jumpengine, which shows then -1 JE, again deconstructing -2 and so on, apparently infinitely. Best of all, I got a level on jump engine efficiency the second or third time I did this. Just to look how far it would go, I deconstructed ´til -21, then scraped the thing.
I did pay a price, however: scraping -21 jump engines got me -907 wealth, -181t Duranium and -725t Sorium
