On macOS, Safari releases are independent of OS releases and show up as separate updates as and when they’re released. They may coincide on the date sometimes. It’s not like iOS where Safari updates never show up as separate updates, and are bundled with iOS updates.
Do you happen to know if the WKWebView always uses the latest Safari that's been installed? That's been the thing I'm uncertain about, where I think I've run into situations where the installed Safari should support some JS thing, but Recut doesn't actually have access to it, and I've suspected that WKWebView is just frozen at whatever the OS came with.
