Yeah, probably more consistent to add a highlight there now… padding will need to be reworked a little and it would need to be tested for the 4 category badge types (the box style will be fairly annoying there). Overall it’s a low priority enhancement…
Time might be better spent looking into ways to improve the hamburger menu entirely (revisiting some suggestions in Proposing a left-aligned slide out hamburger menu)? Big sites with a lot of categories are becoming more common, and I don’t feel like this works well at all for anyone…