Banners only take up one block despite appearing to be two blocks high

Put the summary of the bug you're having here

When I placed the new banner block off the hitbox of another banner
I expected the banner to be placed like the other had been, with its bottom section on the ground.

But the banner was placed within the ground
The stop half stuck out of the ground, whilst the bottom half was in the ground

Steps to Reproduce:
1. Place a banner, I found it to be any color banner
2. Then place another banner off of the hitbox of the first
3. There you have it, the ground banner.