Time to say what I'm doing.
As you may know, I'm now going for a cyclic animation, rather than a complicated looping script, for emergency lights.
Well, I parented the lights to bones. Before doing any animating, I decided to export the vehicle to see if it looked right.
It did not. Half of the lights were invisible, and one of them was floating above the car and slightly rotated.
I deleted those bones so that (I thought) the car would be just like it was before, except with a completely static light bar, and exported that... and the back-right window was floating above the car. I tried to open the door and Blockland crashed.
I have the time and motivation necessary to go ahead and guarantee that you will see the new Crown Vic on or before July 1, but I'm not certain my plans for the new emergency lights will come with it right away. If I keep having this much trouble with the nodes, I may stick with the old scripted format until I can fix it in a smaller update.
I'm also very excited to work on something else next month.