Sorry, I probably wasn't precise enough and used the wrong terms
I engaged it and it was destroyed, it didn't crash. So everything working as intended. I only mentioned it because I don't know a lot about modding and if there is possibly any relation between these events.
Dreadnought spawned first time, realized it won't land, shot it down, i.e. destroyed it.
A bit later, probably a few ingame days, Dreadnought spawned again and then a few hours later this issue occurs. At first I thought it happened because I've destroyed it again (which I did on the first try) but then I've realized that the game is also trying to spawn this mission when I just leave the Dreadnought alone. He is somewhere over North America when the mission is trying to spawn and the game crashes.
edit:
Works, thank you
And also thank you for making this mod in the first place, I really like it!