Lantern duplication glitch snapshot 18w47b

Put the summary of the bug you're having here

What I expected to happen was...:
The lantern would drop and disappear as a block

What actually happened was...:
The lantern that I put under a powered sticky piston, was there, but when I retreated the sticky piston, the lantern stood there still as a block and also dropped a lantern. After that I could just pick up a second lantern. The other way around it doesn't work. (unpowered and then power it)

Steps to Reproduce:
1. Grab a sticky piston and place it with the upside down.
2. Power the sticky piston with a redstone lever.
3. Put a lantern under the powered sticky piston. (when it has that hanging=true.)
4. unpower the sticky piston. What you will see is that the lantern will stay there, but also drop a lantern.