"Increase Exposure" not working on empty cells of drawings when "Animate Using Animation Tools" disabled

Hello,

I remarked that the “Increase Exposure”/“Decrease Exposure” functionnality won’t work on empty cells of drawings of which the “Animate Using Animation Tools”-checkbox is unchecked. (The functionnality works as expected on frames with an exposed drawing subsitution.)

Is there a way to change this behaviour in the preferences making “+” and “-” also work on these drawings?