Try grepping for the filename of one of the files that's not showing up in your dvr/logs dir:
grep /var/spool/pvr/Restored/Restored2020-03-13.mkv .hts/tvheadend/dvr/log/*
Obviously you'll need to modify the paths to suit your setup. You should get a hit, otherwise it means some of your log files have been deleted.
If so, it is possible to re-import your recordings to TVH, but you will lose meta-data, as that's stored in the logs.