The first fresh install I had was 4.0.9 from OSMC app store. It did not contain the CI adapter so I installed latest stable from the tvheadend repo. Now that 4.2.2 is on app store I thought I'd give it a try and admittedly I probably used my old config rather than starting fresh. This is what it looked like before
But I just removed the config directory (if you refer /home/osmc/.hts/tvheadend) and installed 4.2.2 from app store but it doesn't matter, the adapter is still missing. This is how it looks now
If I understood SwedishChefs post above correctly, he has the same issue.