Redstone doesn't break after Shulker Box has been opened.

If you place redstone on top of a Shulker Box then open it, the redstone stays, doesn't break and powers any circuit it is connected to.

What I expected to happen was...:
The redstone to break after opening the Shulker Box.

What actually happened was...:
The redstone stayed on top of the shulker box and could still be powered.

Steps to Reproduce:
1. Place shulker box facing upwards.
2. Place redstone on top of shulker box.
3. Open shulker box, the redstone should stay after it has been opened.

Screenshots: (In Order)