Optimizing properties of level 2 removes hsla values

For some unknown reason, when using 2 level, color values specified in hsla format are removed.

Environment

• clean-css version - npm ls clean-css: 5.1.0
• node.js version - node -v: 12.13.0
• operating system: Ubuntu 20.04

Configuration options

var CleanCSS = require('clean-css');
new CleanCSS({
  inline: false,
  level: {
    1: {
      all: false,
    },
    2: {
      all: true,
      restructureRules: true,
      removeUnusedAtRules: false,
    },
  },
})

Input CSS

.test {
  border: 1px solid hsla(0, 0%, 65.5%, 0.2);
}

Actual output CSS

.test {
  border: 1px solid;
}

Expected output CSS

.test {
  border: 1px solid hsla(0, 0%, 65.5%, 0.2);
}

[lex111]

@jakubpawlowicz wow how quickly, many thanks!

[jakubpawlowicz]

And btw sorry for this causing you trouble!