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When you enter the HEX value for sunlight or shadow color, the green color value is replaced with the blue color value e.g. aabbcc changes to aaccbb.
It's true, I just tested it aabbcc becomes aaccbb.
It also works the other way around so you can get around it by entering aaccbb to get aabbcc.
This is a known issue, I don't personally know what causes it, but maybe Jon knows.
I see it, it's right here:
https://github.com/andrewphorn/ClassiCube-Client/blob/master/src/main/java/com/mojang/minecraft/gui/inputscreens/LightColorInputScreen.java#L20