dists/bionic/*/binary-*/cnf/Commands-* do not exist at all on the mirror network, so it's not clear to me that the replacement for command-not-found-data is actually implemented at all or where the metadata lives.
dists/bionic/ */binary- */cnf/Commands- * do not exist at all on the mirror network, so it's not clear to me that the replacement for command- not-found- data is actually implemented at all or where the metadata lives.