Rank animation is played for new panels when scrolling down, showing the
previous rank belonging to the previous beatmap assigned to that
specific panel instance.
This always confuses me since stable used this for the main storage
location of the icon. We don't reference this anywhere so it's just
weird to still keep this around.
Of note, this has a lazer icon from many years ago still inside it.
This was not fatal but with this change it should recover in a slightly
better way.
Also incidentally fixes the cache refetch potentially being attempted
twice by each of the two background population tasks that use it.