No complaints, I want to add my experience, I think the loss of keyboard focus has been around on next just a little longer than compositor and is not related.
I've been on 2020.x release candidates and the problem was less noticeable, then a few days ago I switched to next. Keyboard is lost, i think, if falkon ( qupzilla ) is used and now I'm browsinf g the properties a lot. Avoiding opening browser allows switching windows and using editor.
I'm on Fedora 31 with Fluxbox.
Are you using a multiple camera setup or just a single window with a single camera?
single window with a single camera