Undo Manager with Color Transparency Tool X8

Undo Manager does not record my Color Transparency clicks.  It records other actions, making layers, Clone Tool, but not the Color Transparency Tool.  When I do some individual clicks with Color Transparency Tool and I make a mistake, I hit Undo and it zeros out everything I did.  I know you must do individual clicks (let go of mouse) for actions to be recorded. I think it's a bug with Undo and Color Transparency Tool.