No highlighting of HTML content?

Hi,

Is highlighting with AsHighlighted not supported on indexed content that contains HTML tags? I am getting a search hit on the content document, but the value returned from AsHighlighted is empty. If I index the field without HTML tags, the highlighting works. (I am not using unified search, I'm using typed search.)

Update: some times I get a highlighted result back, but the marking tags interfere with the HTML tags.