Same here. It flickers on and off intermittantly. Here I am stopped at a red light and it is NOT showing brakes are on, even though they are and I am in HOLD. (The Faint yellow circle is me circling where it should be a red line showing the brakes are on). Wondering if I should submit this to Tesla Service through the app? Maybe if more people complain about it they will fix it.
Also, even when it's on, it's very difficult to tell. I'd much prefer a Red circle to appear at the top, or the word BRAKE to appear or something. There is certainly enough room along the top for that. I am on software version 2023.2.10 and it started happening 3 or 4 software updates ago. Before that it worked as it should.