Spotlight in Mavericks does not search Tags - how to enable?

I have defined a couple of tags in Mavericks. If I search inside Finder, tags work as expected:

It recognizes that "Firma" is a tag.

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If I select it and press enter, it turns into "Tag:Firma".

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However if I do the same in the global search (CMD+SPACE), it seems to have no idea about tags:

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Is there a way to fix this or is it a known bug?

Tags have never worked that way for me. I don't know if they should, but they work for me if I prefix the tag with tag: like this:

tag:Firma

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