Golden Carrot Aura in Sirad's Skytomb

[( ͡° ͜ʖ ͡ °)]

The aura glows when i'm standing around the spot where you need to drop a vegetable in a hole to get golden carrots in return - already did that. It points somewhere below the hole, like there's a hidden room underneath it, but i can't find the entrance.
Is it a bug, or am i just missing it?