Blocks placed are deleted upon quitting to the title screen

Put the summary of the bug you're having here

*What I expected to happen was when I quit the game and went back in, my places blocks would be there.

*What actually happened was when I went back into my game, all my placed blocks were gone.

Steps to Reproduce:
1. Place any block as many as you want.
2. Click pause and hit "Quit to Title"
3. Re-enter the same world, and all the blocks you placed are now gone!!