When placing a cobblestone fence on top a chest for example, it doesn't seem to stop chest from opening and many other blocks too. 

How to reproduce

Start by crafting 2 chests, and combine them into 1 large chest
Then add for example: a cobblestone fence or pistons on top of chest, the chest will still open.

Note this bug may work with only some blocks.

Observations: Chest still opens after placing specific types of blocks on top of it.
Expectations: Chest should never open after placing blocks like piston or cobblestone fence on top of it.