Using revert in a shorthand property is converted into undesirable value

[kboucher]

Precheck

• Related to Multi-value CSS involving 'unset' is changed into an invalid CSS #1103, but the fix for that seems to be specific to unset
• I was unable to test this in the latest release

Environment

• clean-css@3.4.28
• node.js version - v16.14.1

Configuration options

• Unknown (transitive dependency)

Input CSS

list-style: revert;

Actual output CSS

list-style: outside;

Expected output CSS

list-style: revert;

Workaround

Do not use shorthand:

list-style-type: revert;