Cannot undo manual pitch control keyframe adjustment

When performing manual pitch correction, if I just adjusted a pitch key frame then press ctrl-Z (undo), it does not undo the adjustment to the key frame. Rather, it undoes the action before I selected "manual pitch correction (process..)"

There are two issues here:

(1) unable to undo adjustments to pitch keyframes

(2) able to undo the actions outside of the pitch correction process

This feels counter intuitive and could cause confusion and loss of edit.

I propose during the "manual pitch correction (process..)", the undo action should undo keyframes adjustments or other actions since "manual pitch correction (process..) was clicked. And if there is no more keyframe adjustment to undo, it should do nothing and beep or display a message "nothing to undo". If the user wants to undo the action before he click "manual pitch correction (process..)", he would have to cancel out of the pitch correction process and click undo.