X-ray created when a banner is placed on the side of a block at y=64

Summary:
An x-ray is shown when a banner is placed to the side of a block, replacing snow layers (both naturally generated and manually placed), at level y: 64. Any banner type will cause this. X-ray is only limited to the top of the block that is directly below the banner at y: 63. The block that the banner is placed on does not affect anything. The snow layer count does not affect anything. X-ray is only removed when blocks around it has changed state, when the chunk reloads or when the game is restarted.

Steps to reproduce:

1. Place a snow layer at y=64.
2. Place a full block next to it (at y=64).
3. Take the banner.
4. Aim for a full block to place a banner instead of a snow layer.

Observed results:
Banner created x-ray.

Expected results:
The banner will not create x-ray.