I did a hole in my mesh in Blender 2.82 with boolean modifier, and I made some changes about topology so that the subdivision surface modifier can work properly. I removed all the doubles, and I checked the normals, they are fine.
But the result isn't what I've expected. We can see a bump, right below the hole (in red on the image).
Does someone have any idea ? I don't have any problem when I do the same thing on a sphere. Thank You !