Structures spawns broken (probably due to chunks)

So, as the title says: I added structure, airship. Structures spawn, pretty nicely I'd say, but they're sometimes broken. So when they broke, they look like this:

Or this:

And from what I checked, the "cut" is where the new chunk loads.
If it's helping, I defined their "probability of generation" on 10 000 / 1 000 000, so they were pretty common. Already changed that to 1000 / 1 000 000, but I didn't check if it's making any difference on "brokeness" of airships.

So, the question is: how to repair that generator problem?