"Object Drawing" doesn't work in "paint behind" Brush mode

hi, as far as I can remember, in previous versions of Animate (or back in Flash) one could keep Object Drawing on even when using the Brush's very useful "paint behind" mode.

Now I see it will only work with "paint normal" mode. I find it was much better when you could paint behind without welding shapes, as happens now when Object Drawing is not on or (as I suspect) not working.

Does anyone know whether this is a bug or if it's just a new (and in my humble opinion, worst) way this feature works?

thanks!