get unexpect color

[xxholly32]

input

import { Hct, argbFromHex, hexFromArgb } from '@material/material-color-utilities';

export const hexToHct = (hex: string): number[] => {
    const hclColor: Hct = Hct.fromInt(argbFromHex(hex));
    return [hclColor.hue, hclColor.chroma, hclColor.tone];
};

export const hctToHex = (hct: number[]): string => {
    const hctColor: Hct = Hct.from(hct[0], hct[1], hct[2]);
    return hexFromArgb(hctColor.toInt());
};

const [hRotate, cTarget, tStart] = [209, 2, 73]
console.log("initial：", [hRotate, cTarget, tStart])
console.log("initial to hctToHex ：", hctToHex([hRotate, cTarget, tStart]))
console.log("initial to hctToHex to hexToHct：",hexToHct(hctToHex([hRotate, cTarget, tStart])))
console.log("initial to hctToHex to hexToHct to hctToHex：",hctToHex(hexToHct(hctToHex([hRotate, cTarget, tStart]))))

output

initial： (3) [209, 2, 73]
initial to hctToHex ： #b4b3b3
initial to hctToHex to hexToHct： (3) [214.8962657784951, 1.6994043852090706, 73.02219038271852]
initial to hctToHex to hexToHct to hctToHex： #b4b3b3

I wonder why 1 and 3 are different and 2 and 4 are the same. Is there some adjustment in the transformation?

[Kyant0]

Because there may be a gamut clipping (chroma reduction) in the conversion from hct to sRGB, to let the color fall in the sRGB gamut. HCT can express any impossible colors, so we should do chroma reduction to let it correctly display.