Can't "keep only selection" from some burst photos
Have noticed this "situation" a few times in a few different Photos libraries.
When sifting through burst photos, sometimes when you open a burst photo series to make your selection and click 'Done', it asks "would you like to keep" question and gives you the option to "Keep Only Selection" or "Keep Everything" (which I would call normal behavior).
But sometimes it never asks the question and just assumes you want to "keeps everything". There's no choice to get rid of the ones you don't want.
Any explanation why on some bursts you can't "Keep Only Selection"?