Hi Diego !
I just tested with ARB and you are right !
I had never paid attention to this detail before. Probably because the TDC button is not visible when we are on the radar with ARB.
So I think it's better to leave everything like that in the DGUI.
We don't use the radar much anyway.
There's no need to worry about a little bug that also exists elsewhere (in other GUIs) and doesn't have a big impact on the way the game is played.
Thank you for your answer