I just updated from 1210 to 1213 and now on pro7 max (SD)I see artefact every 10-60 seconds.
There have been thousands of continuity errors in tvheadend.
So I‘ve gone again into addons > libre tv cards config app and selected default drivers again. This was already done before. After the rebbot it now seems working normal again.
So it is still the same serious bug that exists in 8.x after 7.90.010 and something of my settings has been reset here too.