You can see a block through the back of the item frame with glass!
What I expected to happen was...:
To not see blocks on the other side of the item frame.
What actually happened was...:
When I looked down through the glass on the other side, I saw the back of the block through the back of the item frame.
Steps to Reproduce:
1. Build a glass wall.
2. Put item frames down and then place any block in them.
3. Go on top of the glass and look down.