while pressing control and pick block, the NBT data of the container is copied, but when you place down the container, it is empty.
What I expected to happen was...:
i expected that the items would get copied, as in the other versions.
What actually happened was...:
the contrainer was empty
Steps to Reproduce:
1. place a container
2. fill it
3. press CTLR+MIDDLE CLICK.
4. place the copied container
5. see that the container is empty
Can confirm. The custom name of the block isn't copied either.