Well that’s a Rube Goldberg title.
I consider this a -bug-, but it’s so arcane that perhaps SB considers it a ‘feature’.
As you probably know, if you click on a CPR from Windows Explorer, it will launch Cubase with that project. Great. -However-, what I just learned today (after 18 years) is that doing so does -not- add that CPR to the Files ‘Recent Projects’ list. Only projects opened from the Files menu get that distinction. It’s a detail, but it should be cleaned up.