The header section on the tag list will give an idea about listed tag relates to what… I mean this tag is useful to read order properties and it returns assigned price tag to order. It works because you used {PRICE TAG} inside order state changed event. You are not testing active price tag here You are testing order’s price tag so even after you disable happy hour it will still return positive.
As a general rule terminal specific values (not ticket or order related) can be accessed with {:CURRENTXXX} settings. So what you need to search for that case is {:CURRENTPRICETAG} setting but it is not available. What I’ll do to make that setting available to you is just pushing it as a program setting like you do with Update Program Setting. However there is a difference here. CURRENTPRICETAG is not terminal based. It is system wide so handing it manually will be a better choice.