Can you post some logs?
For Tvheadend --trace descrambler,capmt,csa
for osam -d 128
Are you building your own images?
No, I don't build LibreELEC image by now. I use the one from afl1 on LibreELEC community build. I built the addon service tvheadend server which the url source points to the tvheadend official github, and also built one using your github source (the extended cw branch) .
I'll post some logs later.