Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: any
• OS Version: any

Steps to Reproduce:
VS Code incorrectly flags css unicode-range wildcards as syntax error. A red squiggle will appear on the unicode-range line and on the closing bracket.

Example:

@font-face {
	font-family: 'MyWebFont';
	src: url('myfont.woff') format('woff');
	unicode-range: U+00??; /* wildcard range */
}

This issue was opened before as #54889 but then closed due to lack of information.