Bed feet z-fight with the back faces of item frames

The bug

If a bed is placed inside of an item frame, and the back of the item frame is visible, the bottom faces of the feet will coincide with the back face causing z-fighting to occur.

How to reproduce

1. Place an item frame on glass
2. Place a bed inside of the item frame
3. Observe

Expected results

There would be no z-fighting.

Actual results

There is.