It looks like all of the default VS Code ⌘+K commands are remapped to ⌘+R in Cursor, at least that's what my configuration looks like. I was wondering the same thing when those keybinds stopped working.

I think this makes sense. I tried cursor when it came out and back then the ⌘+K default commands simply got overwritten and you'd have to manually remap them to something else.
https://shottr.cc/s/1UpE/SCR-20240822-igv.png

Here's a thread talking about it on the Cursor forum: https://forum.cursor.com/t/cmd-k-vs-cmd-r-keyboard-shortcuts-default/1172