Put the summary of the bug you're having here

What I expected to happen was...:
I was making a redstone machine when a notice this issue

What actually happened was...:
The gravity block Like sand and gravel are breaking when shouldn't

Steps to Reproduce:
1. Make a 3x3 sand redtone door
2. Activate and desactivate de machine
3. And the sand is becomes a item, this shouldn't happening