Okay these "Background Security Improvements" are definitely worse than RSRs. They show up at random times in your Settings app, and if you tap anywhere else, they disappear immediately. You can find them again, but they're not under Software Updates where they should be, but under Privacy & Security > Background Security Improvements, which also does not seem to show up in search.

EDIT: HOLY SHIT I have to enable "Automatically Install" in order to even be allowed to download them MANUALLY?! And there's no progress indicator either?? Whoever approved this should be hurled into the sea.