Loading a structure that has doors using /structure causes the doors to break.

Steps to Reproduce:

1. Save any structure with a door.
2. Load that structure using /structure and make sure to use an animation (block_by_block or layer_by_layer).
3. Set the animation to last for a few seconds (ex:5 seconds).

Observed Results:
You will notice that the door appears briefly then breaks (easily noticeable with layer_by_layer option) due to the first half of the door appearing first and missing the second half, which causes it to break.

Expected Results:
The door should not break.