This doesnt seem correct and if it is, then my current install of Word has not been working correctly for years and suddenly it has started working correctly, and in a fashion that would be totally counter intuitive. No!

Prior to this recent change in functionality, if for instance I selected All items of Body Text and then clicked to change them to Normal - Body Text would dissapear from Styles In use (not retained because it had once been applied), and which it has stopped doing recently. Believe me I am not new to word.

Any style that is now "in reality in use" in the document shows in the formatting panel as "not currently used". And this doesnt matter which filter is selected i.e Styles in Use, Available Styles or All Styles.

So word is not playing the game at the moment.