This must have been documented by now, but I haven't seen it doing a quick search of the forums.
Whenever I create a new adjustment layer and make a correction, if I try to undo (using either cmnd z or menu) the actual correction is undone, but the slider does not reset. If it is a curve adj layer andi I set a point, undoing the move again results in the correction being undone, but the point on the curve remains. This can get extremely confusing and causing me problems. Too bad there is no beta program anymore. I'd have logged this one immediately. Is this being addressed?