Selecting a clip is counted as "first click" to add a keyframe
i think that the original ghost keyframe is created double clicking a clip with an effect on IT... and this happens sometimes because the first CLICK on an unselected/unfocused clip is "counted" as the first double click of adding a keyframe.
first click need JUST to select the clip and doesn't need to be counted as a "preliminary" request of adding a keyframe.
on an unfocused clip:
first click: focus the clip second click : identified as first part of a double click (to add a keyframe for example on a keyframmable volume effect) third click : add the keyframe.
right now... a double click focus a clip and add a keyframe.