Abandoned range secret?

[Illarox]

I just reached the Abandoned range. When you walk down the stairs there's a cave to your right with a healing/save point shard thing and a small jumping on platforms to reach to the end of the cave with a spider.
Going back I noticed a chest hidden and I picked it up. But there's still a sound of a secret nearby close to the chest or the entrance from the other side when I am wearing the Compass.

Anyone knows if this is a bug (doesn't register that I picked up the chest) or if there is another secret here that I am missing?

[nangasaur]

I searched all over to try and figure out how to get that "secret sound" to go away. Couldn't find anything, either. Likely just a bug...until/unless someone else figures it out!