parsing failure with border shorthand and css4 hsl() color

[phiw13]

clean-css drops the color parameter in a border short-hand when the color is specified using css4 comma-less translucent hsl() – and possibly other color formats such as rgb() / hwb / but I have not tested those.

input: border-top: 1em solid hsl(0 5% 5% / .5);

actual output: border-top:1em solid;

expected output: border-top:1em solid hsl(0 5% 5% / .5);

The border shorthand can be anything of border or border-top, etc. Surprisingly, the logical equivalent (e.g. border-block-start) seems to parse correctly.

cleancss -d -O2 --format 'breaks:afterComment=on' -o style.min.css style.css

clean-css-cli version: 5.6.2
macOS 13.3.1