Inventory Wipe Bugs With 1.8 Snapshot 14w03b and Version 1.7.2

When switching game versions from Minecraft snapshot 14w03b to Minecraft Version 1.7.2 ALL inventories will be wiped including chests and mine-carts. This bug only happens to worlds that were loaded in the snapshot. Note- I was using Optifine-A9 IN 1.7.2, but optifine is not needed for the bug

What I expected to happen was for my inventory to be the same and nothing to change. I went into the snapshot to use the new enchanting system expecting nothing to happen wrong. And for my inventory to stay the same

What actually happened is that I went into the snapshot. Loaded my world, to do some enchanting. Once I finished the enchanting. I switched back into 1.7.2 and all of my inventories were wiped.

Steps to Reproduce:
1. Load a world in 1.7.2
2. Get something in your inventory.
3. Close the World
4. Load The world in 14w03b
5. Close the world and launcher
6. Re-open the Launcher
7. Set the game version to 1.7.2
8. Load the same world you loaded in the snapshot
9. Your inventory will be cleared along with all chests.