What factors determine bokeh dilinearity? How to avoid it in actual shooting?

Classical soft focus should theoretically have no bilinearity. If the spherical aberration is not corrected at all, the entire circle of confusion will be very soft. And when we start correcting spherical aberration, if we "overcorrect", the shape of the circle of confusion on both sides or one side of the depth of field may not be a uniform circle, but a bright bubble with an outer ring. "Bokeh dilinearity" should be a unique term in the Chinese photography circle - when shooting with a lens with "over-corrected" spherical aberration and placing branches and other objects out of focus, a very "irritable" out of focus will appear.