items pop out of ground if block updates in low light

Put the summary of the bug you're having here

*What I expected to happen ....
Items in low light stay placed until broken or trampled

What actually happened was...:
If a block that must be placed on another block (wheat, torch, etc) receives a block update (place a block next to it) and the light level is low enough, it will pop out of tye ground. What specifically happened was a tree grew next to a sapling in low light and the saplings next to it popped out of the ground. My wheat also broke when one grew a stage. My torches also broke when i tilled some grass next to it.

Steps to Reproduce:
1. Place a torch on a block
2. Wait until night or it is otherwise dark
3. Cuase a block update by placing a block next to the torch