Guild Wars 2

I thought the Sorrowful Sound PoI on (on, in or under) the island with the puzzle, popped when you went up top, where the chest is. I’ve been up and run all over the top 2Xs now and nothing. I can see the PoI very vaguely on the map but can’t get it to even say ‘Undiscovered Point of Interest’ on mouseover. I’ve tried all 3 levels on the map.

Did it get changed? Any help most appreciated.

its not a PoI. It looks like a PoI, but it is not a PoI

This caught me out too.