When exploring my world I cannot find any dry caves that generate unless I find an ocean that does contain caves that are filled with water. However, if I were to go to the lowest point of these water caves and break a few blocks down, then I would find a cave that is not filled with water. The caves that are not filled with water never generate on the surface, I always have to find a cave filled with water and dig down until I do find a cave without water. By the way I have all experimental toggles on.