Wishing Compass not pointing towards Khazad-Dum

My wishing compass is not pointing towards Khazad-dum (Bal) despite me being in the magma fields when using it. Usually it just points towards a random place like Nucleus or the Precursor city. Is this a bug or am I doing it wrong?

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Robert Louis Stevenson

cant use a wishing compass after my game crashed : r/hypixel

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Khazad-dûm, Hypixel SkyBlock Wiki

can someone explain how the wishing compass works?