+++ This bug was initially created as a clone of Bug #1155879 +++

I noticed this problem in the journal: mandb.service seems to fail for unknown
reasons, but "success" is reported:
+++ This is new output that matches exactly that of Bug #1155879 +++
# systemctl status mandb.service
○ mandb.service - Do daily mandb update
     Loaded: loaded (/usr/lib/systemd/system/mandb.service; static)
     Active: inactive (dead) since Sun 2023-07-23 07:40:05 CEST; 10h ago
TriggeredBy: ● mandb.timer
       Docs: man:mandb(8)
             man:catman(8)
    Process: 2116 ExecStart=/usr/lib/man-db/do_mandb (code=exited,
status=0/SUCCESS)
   Main PID: 2116 (code=exited, status=0/SUCCESS)

From journalctl:
Jul 23 07:39:00 Schnecke2G.Jacobs.home systemd[1]: Started Do daily mandb
update.
Jul 23 07:39:00 Schnecke2G.Jacobs.home systemd[1]: Starting Do daily mandb
update...
Jul 23 07:40:05 Schnecke2G.Jacobs.home do_mandb[2371]: find: ‘standard output’:
Datenübergabe unterbrochen (broken pipe)
Jul 23 07:40:05 Schnecke2G.Jacobs.home do_mandb[2371]: find: Schreibfehler.
Jul 23 07:40:05 Schnecke2G.Jacobs.home systemd[1]: mandb.service: Deactivated
successfully.
Jul 23 07:40:05 Schnecke2G.Jacobs.home systemd[1]: Finished Do daily mandb
update.

Summary is translated from German.