I some blocks placed such as an enchanting table, an anvil, a chest, some sandstone, furnaces, and a crafting table. As soon as I went exploring the chunks unloaded. When I came back they disappeared. I also chopped down some trees and they came back.

Put the summary of the bug you're having here

What I expected to happen was...:
They would be there

What actually happened was...:
They were gone

Steps to Reproduce:
1. Place Blocks
2. Run Far Enough to Unload The Chunk
3. ...Go Back and The Blocks Will Be Gone