Whirl Islands' 3rd hyper potion

does anyone know which tile the third hyper potion is? this one specifically from the wiki:
“Inside, B1F; on the ground from the southeastern entrance, near the Timer Ball (hidden)
I cannot find it for the life of me. It’s not super important to find, as I can always by more of these potions, but my inner loot goblin makes me wanna find it.