Address bar autocomplete and new tabs

Hi – When I type a URL into the address bar, I get a list of suggestions for autocomplete. I can select the site I want, hit enter, and go to that site, or what I usually do is hit command+enter, which opens the site in a new tab. But for the last couple days, when I hit command+enter, the autocomplete deselects and I don't open a new tab. For example, if I type "go," the autocomplete suggests "google.com," I hit command+enter, and the current tab I'm on goes to "go.com." This is really a pain because it's a very natural part of my workflow to go to websites in new tabs. Of course I can just open a new tab and type in the URL there, but I'd love to be able to keep using my browser the way I'm used to. Is it possible that I made a change to my settings accidentally? I can't find anything in the Firefox settings but I imagine i must have done something. I did check and none of my keys are stuck or anything. I'm on MacOS Monterey, Version 12.7.2, and my Firefox is version 136.0 (64-bit) Thank you very much!