Hi,
We have investigated this, it is also happening with other renderers if selected in the render setup menu.
So unfortunately this is an issue with 3ds Max and we are unable to fix it from our side.
I apologise for not being able to provide you with a solution to this :(
Thanks,
Rowan
Which Max versions did you test? Also, you need to check the renderer specific tabs, not the general tabs.
I just tested this and it IS fixed in ART and Arnold in Max 2018.4 and 2019.3, Scanline is not fixed and has the same problem.
General tabs like 'Common' and 'Render Elements' will need to be fixed by Autodesk, that's true. Any renderer related tabs need to be fixed by the renderer developers. That's why ART and Arnold don't have this problem, their UIs were converted to Qt some time after 2017 I guess.
In any case, Autodesk can not fix Corona related tabs, it is up to you to take care of this.