Upon attempting to import anything, regardless of who made it or if it is a texture pack, a behaviour pack or a world the game causes it to fail. The issue at hand can be verified using any mcworld or mcpack file and attempting to import it. However for legal reasons regarding that I don’t own the copyright to those worlds I won’t provide a specific one. 

The reason why I cared enough to report this issue is because this issue hurts everyone. It makes it more difficult to back up worlds, and it makes it more difficult to share creations among friends.