How to find it: Any # of ice creams, go to level editor. Spam a bunch of mobs on one spot, then "Test from here" right on top of them. You'll need 20-40, idk how many, mobs there. Might depend on computer. Then, Beebo will not spawn. Go back to the pause menu, and return to hub. You'll see an ice cream there. If you do new game and collect the roof and the normal ice cream, you'll still see its active until you defeat the sun. I don't know how this could be used. Maybe with WTW you'd clip through that wall and collect it instantly saving like, 5 minutes?

Edit: You might need to angle your camera to see under the map, but its there. I've gotten it consistently. (Not the ice cream the glitch)

Edit 2: I got an image of it:

Edit 3: Better image

Edit 4: OH MY GOD! IT DEPENDS ON WHERE YOUR ARROW IS IN THE LEVEL! This is insane. We can see ANYWHERE in the hub with this glitch.

i knew it existed for a long time but just assumed it was the observatory cream

Actually, this is the ice cream "The Secret of the Mirror" and can be obtained using WTW or hub duplication if you don't want to get it normally