So it seems there's an issue with these doors that make them fly away and explode.

I did report this to the devs but maybe you can make a PR and fix it faster :P

Steps to reproduce:
1. Make a new ship and place a long line of armor blocks
2. Place an advanced door at one end
3. Split the ship by making the part without the door have more blocks (if the other grid has less blocks it won't cause the issue)
4. Remove a block from the grid that doesn't have the door and watch the door grid fly away and explode xD

Happens with both small and large ships and tested with various advanced doors, happens with all that I've tested with.