Flight Master's Whistle does not work in the Circle of Spirits

[Trove]

WoW Freakz link:
https://www.wow-freakz.com/item_finder.php?item=141605&&name=flight-master-s-whistle

Bug description:
The Flight Master's Whistle does not work in one tiny area of Val'sharah on the Broken Isles called the "Circle of Spirits."

The Flight Master's Whistle should work in all outdoor locations on the Broken Isles.

Proof:
https://youtube.com/watch?v=Dz1670PXLVo:



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