Reproducing the bug on zesty:
$ dpkg-query -W systemd
systemd	232-21ubuntu5
$ bash test.sh 
              accounts-daemon.service :     Tasks: 3 (limit: 4915)
                        acpid.service :     Tasks: 1 (limit: 4915)
                          atd.service :     Tasks: 1 (limit: 4915)
                         cron.service :     Tasks: 1 (limit: 4915)
                         dbus.service :     Tasks: 1 (limit: 4915)
                       iscsid.service :     Tasks: 2 (limit: 4915)
                 lvm2-lvmetad.service :     Tasks: 1 (limit: 4915)
                        lxcfs.service :     Tasks: 3 (limit: 4915)
                       polkit.service :     Tasks: 3 (limit: 4915)
                      rsyslog.service :     Tasks: 4 (limit: 4915)
                        snapd.service :     Tasks: 6 (limit: 4915)
                          ssh.service :     Tasks: 1 (limit: 4915)
             systemd-journald.service :     Tasks: 1 (limit: 4915)
               systemd-logind.service :     Tasks: 1 (limit: 4915)
             systemd-networkd.service :     Tasks: 1 (limit: 4915)
             systemd-resolved.service :     Tasks: 1 (limit: 4915)
            systemd-timesyncd.service :     Tasks: 2 (limit: 4915)
                systemd-udevd.service :     Tasks: 1
              accounts-daemon.service : 
                        acpid.service : 
                          atd.service : 
                         cron.service : 
                         dbus.service : 
                       iscsid.service : 
                 lvm2-lvmetad.service : 
                        lxcfs.service : 
                       polkit.service : 
                      rsyslog.service : 
                        snapd.service : 
                          ssh.service : 
             systemd-journald.service : 
               systemd-logind.service : 
             systemd-networkd.service : 
             systemd-resolved.service : 
            systemd-timesyncd.service : 
                systemd-udevd.service : 
              accounts-daemon.service :     Tasks: 3 (limit: 4915)
                        acpid.service :     Tasks: 1 (limit: 4915)
                          atd.service :     Tasks: 1 (limit: 4915)
                         cron.service :     Tasks: 1 (limit: 4915)
                         dbus.service :     Tasks: 1 (limit: 4915)
                       iscsid.service :     Tasks: 2 (limit: 4915)
                 lvm2-lvmetad.service :     Tasks: 1 (limit: 4915)
                        lxcfs.service :     Tasks: 3 (limit: 4915)
                       polkit.service :     Tasks: 3 (limit: 4915)
                      rsyslog.service :     Tasks: 4 (limit: 4915)
                        snapd.service :     Tasks: 6 (limit: 4915)
                          ssh.service :     Tasks: 1 (limit: 4915)
             systemd-journald.service :     Tasks: 1 (limit: 4915)
               systemd-logind.service :     Tasks: 1 (limit: 4915)
             systemd-networkd.service :     Tasks: 1 (limit: 4915)
             systemd-resolved.service :     Tasks: 1 (limit: 4915)
            systemd-timesyncd.service :     Tasks: 2 (limit: 4915)
                systemd-udevd.service :     Tasks: 1

Upgrading
$ dpkg-query -W systemd
systemd	232-21ubuntu7
$ bash test.sh 
              accounts-daemon.service :     Tasks: 3 (limit: 4915)
                        acpid.service :     Tasks: 1 (limit: 4915)
                          atd.service :     Tasks: 1 (limit: 4915)
                         cron.service :     Tasks: 1 (limit: 4915)
                         dbus.service :     Tasks: 1 (limit: 4915)
                       iscsid.service :     Tasks: 2 (limit: 4915)
                 lvm2-lvmetad.service :     Tasks: 1 (limit: 4915)
                        lxcfs.service :     Tasks: 3 (limit: 4915)
                       polkit.service :     Tasks: 3 (limit: 4915)
                      rsyslog.service :     Tasks: 4 (limit: 4915)
                        snapd.service :     Tasks: 5 (limit: 4915)
                          ssh.service :     Tasks: 1 (limit: 4915)
             systemd-journald.service :     Tasks: 1 (limit: 4915)
               systemd-logind.service :     Tasks: 1 (limit: 4915)
             systemd-networkd.service :     Tasks: 1 (limit: 4915)
             systemd-resolved.service :     Tasks: 1 (limit: 4915)
            systemd-timesyncd.service :     Tasks: 2 (limit: 4915)
                systemd-udevd.service :     Tasks: 1
              accounts-daemon.service :     Tasks: 3 (limit: 4915)
                        acpid.service :     Tasks: 1 (limit: 4915)
                          atd.service :     Tasks: 1 (limit: 4915)
                         cron.service :     Tasks: 1 (limit: 4915)
                         dbus.service :     Tasks: 1 (limit: 4915)
                       iscsid.service :     Tasks: 2 (limit: 4915)
                 lvm2-lvmetad.service :     Tasks: 1 (limit: 4915)
                        lxcfs.service :     Tasks: 3 (limit: 4915)
                       polkit.service :     Tasks: 3 (limit: 4915)
                      rsyslog.service :     Tasks: 4 (limit: 4915)
                        snapd.service :     Tasks: 5 (limit: 4915)
                          ssh.service :     Tasks: 1 (limit: 4915)
             systemd-journald.service :     Tasks: 1 (limit: 4915)
               systemd-logind.service :     Tasks: 1 (limit: 4915)
             systemd-networkd.service :     Tasks: 1 (limit: 4915)
             systemd-resolved.service :     Tasks: 1 (limit: 4915)
            systemd-timesyncd.service :     Tasks: 2 (limit: 4915)
                systemd-udevd.service :     Tasks: 1
              accounts-daemon.service :     Tasks: 3 (limit: 4915)
                        acpid.service :     Tasks: 1 (limit: 4915)
                          atd.service :     Tasks: 1 (limit: 4915)
                         cron.service :     Tasks: 1 (limit: 4915)
                         dbus.service :     Tasks: 1 (limit: 4915)
                       iscsid.service :     Tasks: 2 (limit: 4915)
                 lvm2-lvmetad.service :     Tasks: 1 (limit: 4915)
                        lxcfs.service :     Tasks: 3 (limit: 4915)
                       polkit.service :     Tasks: 3 (limit: 4915)
                      rsyslog.service :     Tasks: 4 (limit: 4915)
                        snapd.service :     Tasks: 5 (limit: 4915)
                          ssh.service :     Tasks: 1 (limit: 4915)
             systemd-journald.service :     Tasks: 1 (limit: 4915)
               systemd-logind.service :     Tasks: 1 (limit: 4915)
             systemd-networkd.service :     Tasks: 1 (limit: 4915)
             systemd-resolved.service :     Tasks: 1 (limit: 4915)
            systemd-timesyncd.service :     Tasks: 2 (limit: 4915)
                systemd-udevd.service :     Tasks: 1

Looking much better.