Bug LESS lighten/darken functions no longer work as expected

[Xon]

Code:

<xf:set var="$color" value="rgb(173, 216, 230)"/>
<xf:set var="$lighen" value="{{ parse_less_color("lighten({$color}, 30%)") }}"/>
<xf:set var="$darken" value="{{ parse_less_color("darken({$color}, 30%)") }}"/>
{{ dump($color) }}
{{ dump($lighen) }}
{{ dump($darken) }}

In XF2.2, this outputs:
Code:

"rgb(173, 216, 230)"
"#ffffff"
"#3a9fc0"

In XF2.3, this outputs:
Code:

^ "rgb(173, 216, 230)"
^ null
^ null

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