I mean if it was the ad-blocker, I don't see how a refresh would fix that? But I'm not terribly knowledgeable here so feel free to correct me.

Ah you hadn't mentioned a refresh fixed it. That sure sounds like some kind of race in the JS.

Very fair! I only came back to edit it because right after leaving that comment I went to see if Best Buy had something I needed locally, clicked into search, typed, hit enter, and it fucking broke. Seemingly entirely, even the search button didn't work, so cmd+a, cmd+c, cmd+r, click in again, paste, enter, and that worked.

I just fucking loathe how common this experience is now. Amazon seems to be the only one that doesn't do it, but I've experienced this exact issue on Best Buy, Target, Etsy, Mercari, ebay, and it just DRIVES ME UP THE WALL.