structrue block problem

Put the summary of the bug you're having here

What I expected to happen was...:
The structure blocks should be loaded with the form of the bed when loading the building with the bed.

What actually happened was...:
When the structural block is loaded into the building, the bed becomes the form of goods.

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...