After creating a rocket, restarting the game, and re-entering, the structure is lost

[witzig-heidi]

I created a rocket with multiple blocks in the game and everything was normal. However, I noticed that after creating the rocket, exiting the game, re-entering the game, and loading the save file, my rocket structure disappeared

Later, I experimented with a client that only had this mod installed, and found that it still caused the rockets to disappear!!
And after it disappears, if I try to rebuild the structure, the game crashes!

You can try to reproduce it