darken() compiles to an invalid CSS color

[jtuulos]

I'm having problems with the following SCSS code:

$blueDark: #0064CD;
$linkColor: $blueDark;
$linkColorHover: darken($linkColor, 15%);

a:hover {
    color: $linkColorHover;
}

In the compiled CSS, the color value is invalid and ends up getting ignored by the browser (Chrome):

a:hover {
    color: rgb(0, 24.582%, 50.392%)
}

As you can see, a percentage mark is missing after the red color value.

Is there a possibility to compile all colors with no alpha channel to regular hex colors (and not rgb() with percentages)?

[jtuulos]

It seems that this issue is caused by the CSS compression. When I compile the SCSS with @option compress:no, the first percentage mark does not disappear and the color is interpreted correctly by the browser.