Comment # 1 on bug 1201602 from Jorik Cronenberg

As stated in bind.changes:

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Tue Oct 19 14:00:56 UTC 2021 - Josef M���llers <josef.moellers@suse.com>
...
  *** MAJOR CHANGE ***
  Changed protection of/against "named" from chroot jail to
  systemd protection. This obsoletes subpackage named-chrootenv.

We don't support the chroot environment in Leap 15.4 anymore, since systemd now
handles the protections of the system.