Opacity-rule settings don't work

[saltbr1nger]

I'm trying to limit my picom transparency settings via opacity-rules, but isn't working. Transparency settings still universal. Works for me fine on my non-Regolith i3 setup, but for some reason not with Regolith 2.1. Can anyone advise?

opacity-rule = [
    "80:class_g = 'Alacritty' && focused",
    "40:class_g = 'Alacritty' && ~focused",
    "100:class_g = 'Firefox' && ~focused",
];