Incorrect names
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amaranth commented
Your Noise.gradientCoherentNoise3D is actually Perlin noise and your Perlin noise is actually fBM noise. libnoise made this mistake and since everyone else is either porting that library or copy/pasting from it this is a pretty widespread mix up.
https://en.wikipedia.org/wiki/Perlin_noise
https://en.wikipedia.org/wiki/Fractional_Brownian_motion
https://iquilezles.org/www/articles/fbm/fbm.htm