I have a powerpoint presentation that contains a single master slide with multiple layouts. These layouts contain a number of shapes. The collection of regular slides all have a different one of those layouts.
Now when I copy the slides to a new presentation, without keeping source formatting, for some of these slides parts of the layout are copied into a new layout under the master slide of the new presentation. However, for some this is not the case. It is very hard for me to pinpoint which setting determines whether objects from the master are copied into a new master.
I have compared XML files but both for the slide and the layout there are no differences that point me at why the layout is copied for one but not the other.