Interestingly, the bug is still present in 19.10.
$ ls -l /dev/dvb/adapter0/ total 0 crw-rw----+ 1 root video 212, 0 Feb 24 09:57 demux0 crw-rw----+ 1 root video 212, 1 Feb 24 09:57 dvr0 crw-rw----+ 1 root video 212, 3 Feb 24 09:57 frontend0 crw-rw----+ 1 root video 212, 2 Feb 24 09:57 net0
Interestingly, the bug is still present in 19.10.
$ ls -l /dev/dvb/adapter0/
total 0
crw-rw----+ 1 root video 212, 0 Feb 24 09:57 demux0
crw-rw----+ 1 root video 212, 1 Feb 24 09:57 dvr0
crw-rw----+ 1 root video 212, 3 Feb 24 09:57 frontend0
crw-rw----+ 1 root video 212, 2 Feb 24 09:57 net0