Search doesn't find text in section headings?

I just noticed that when I search for a string in my SAB app, it doesn’t find that string in section headings. Is that known behavior and/or intentional? I would guess that normally the words in a section heading would also be found in the text, but it would seem like if they aren’t there, that one would probably like to have text in section heads found (since they represent the main ideas of the test). Something to ponder…