Strange. I don't think I have a compositor running (i3 wm, not much graphical fluff). Would you mind trying https://github.com/yjftsjthsd-g/keynav and if that doesn't work open an issue? (That's "my" fork, albeit with basically no code from me; I discovered that a number of folks were running separate forks and built a version merging as many as I reasonably could. I think one of them changes the way it renders onscreen and so may have better luck.)