Bug in css validator

Hi,

I found bug in validator.

I have code: .test { background-position : 1px 1px; } . If I
validating this code I get succes comment.
But in correct section I have wrong css code: .test
{background-position : [1px, 1px];}

Now, If I want test this code (from correct section), I get error,
because this code is bad.

I using css 2.1 validator.

--
Szymon Nosal