Bug Penguin renderer & viewport ratio

When I render a view using Penguin, I need to make sure that the frame of the viewport matches the “Live Area” (yellow) of the Safe Frame to make sure it renders the right angle of camera that is selected. Even if I am careful, that technique I came up with is not 100% reliable. Is that a bug of V2.0, is that going to be addressed sometimes in a newer version of Penguin? Is there another trick that works 100%? Thx