I've encountered that a couple of times too, and I agree with why tenths of a millimeter lower idea. When using different layer heights, some end up splitting this incline, thus resulting in that ridge. I've gotten around it by slicing off a very small amount from the bottom, which then moves this slight incline to one layer. Otherwise if you're unable to slice it (I don't think you can in Cura), increasing the size of the lid by small percentages can also resolve it. A final, less ideal, option would be to change the layer height.
Sorry for the bug, but I hope you can get around it!