Pasting a screenshot into Powerpoint results in truncation: even though in MSWord it is perfect
It seems there were a  toolbar at the bottom of the screen that only shows up after you click once on the (messed up) screenshot and has an impressively unhelpful default value set.  Below I show having finally randomly clicked on the correct icon:



Now why the picture would not be already sized properly .. well we can (un)-thank the PP designers for that.