When you change a world icon on the single player loading screen, when you open another world, the banners change to that icon.

What I expected to happen was...:
A change to the world icon in the single player loading screen, I was changing all of them to represent what the world had
What actually happened was...:
Once I changed the icon (we'll call this world World 1), I was changing another icon (World 2), when i logged onto that world, The icon I made (for World 1) was showing on all the banners in World 2.
Steps to Reproduce:
1. Create 2 worlds, each need a world icon (before you change) and give one world a banner
2. Go into the first world's settings and change the world icon, log into that world and leave to change the icon to your last logged out placement.
3. If performed correctly, World 1 will have a new icon in the loading screen
4. Enter World 2 and discover that the banner has changed to that most recent icon you made

Notice on the first picture, the world Titled "Super builds" has the icon of Majors Mask, and in the world Titled "survival", the icon has been changed (unrelated to bug because I logged out) but the icon has the banner with the mask, The second and third piucure show that it changed the entire banner block into the image