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Yes, down-arrow key is disabled. I'd thought it was just me and some badly behaving extension!

Surprised to see that get through QA. (Up arrow works just fine.)

Funny enough, on Mac, fn + down works, although the jumps are larger.

This makes sense, fn + down sends Page Down, which is a different keystroke.

bizarrely it's only the down button (not the up button)

It appears to have something to do with this code (paste the URL into DevTools when you're on the site). webpack:///./frontend/js/trackers/keyboard-tracker.js

There's one other keyboard event listener, but it doesn't appear to do that.

Yeah, was able to replicate this on Chrome 81.0.4044.113 on Windows. Weird.

PageDown still works.