The overall set of scan tables that LE bundles (upstream LinuxTV repo) aren't the same that Tvheadend bundles (own repo with extra commits) but the DVB-S tables for Astra-1{M|N|P}-19.2E appear to be the same in both locations and were updated in the LinuxTV repo from Lyngsat/KingOfSat three months ago.
Perhaps a blind scan with wscan2 needed? .. but I'll let others comment on troubleshooting suggestions as I'm not an experienced Tvheadend user.