CSS Color Adjustment Module Level 1

I realized that Firefox performs a color-mix() in Forced Colors Mode when all the colors in the mix are CSS System Colors:
https://cssence.com/2024/color-mix-in-forced-colors-mode/
https://codepen.io/cssence/pen/abeVWYK

Chromium-based browsers do not. After filing an issue (Bugzilla ticket #1927252), Mozilla responsed they implemented this on purpose, i.e. not a bug but a feature. We should clarify what the behavior should be, the Chromium-based way or the Firefox way.