I believe, in Finale, t’s a stave style ‘Rhythmic Notation’ that “turns the music into beamed and stemmed slashes, all on the middle line of the staff.” - to quote their manual.
It hasn’t been a huge issue, so far, but can be a bit irksome to find a work-around.
Rhythmic and Slash notation would be great, especially when working up a chart for my rhythm section.