I can confirm this behavior on Scrivener v3, but for me Ctrl-L is the Add Link shortcut. (It’s possible that at some point I changed the shortcut. ) Edit Link Ctrl-Shift-L also doesn’t work in Comp mode.
Check for updates only confirms whether you are at the latest update within a particular version, which doesn’t tell us whether you’re on v1 or v3.
I’m experiencing this bug on v220.127.116.11, so I assume that’s what you’re on as well, but could you please confirm your version using Help > About.