`work_dir` and/or `logdir` not set to default on `4.7` ?

[fluca1978]

I'm migrating a configuration from PgPool-II 4.6.2 to 4.7, and I'm having some issues with logdir and workdir.
According to the release notes, logdir has been renamed to workdir (see https://www.pgpool.net/docs/latest/en/html/release-4-7-0.html).
In my previous configuration (4.6) I didn't have an explicit setting for logdir, and the pooler was working. Once I updated to 4.7 the pooler did not start anymore.

$ sudo -u postgres /usr/sbin/pgpool -v
pgpool-II version 4.7.0 (tasukiboshi)

The documentation for work_dir states that it defaults to /tmp, which is a catch-all space (https://www.pgpool.net/docs/latest/en/html/runtime-misc.html#GUC-WORK-DIR).
However, a permission denied error is raised:

$ sudo -u postgres /usr/sbin/pgpool -n -d 
2026-01-26 15:19:07.863: main pid 2916: DEBUG:  read pgpool node id file /etc/pgpool2/pgpool_node_id
2026-01-26 15:19:07.863: main pid 2916: DETAIL:  pgpool node id: 0
...
2026-01-26 15:19:07.980: main pid 2916: FATAL:  watchdog child process exit with fatal error. exiting pgpool-II
2026-01-26 15:19:07.981: main pid 2916: WARNING:  failed to open status file at: "/pgpool_status"
2026-01-26 15:19:07.981: main pid 2916: DETAIL:  Permission denied
2026-01-26 15:19:07.981: main pid 2916: LOG:  shutting down

and I don't have logdir nor work_dir in my configuration:

$ sudo grep logdir /etc/pgpool2/pgpool.conf
#logdir = '/var/log/postgresql'

$ sudo grep work_dir /etc/pgpool2/pgpool.conf
$ 

Now, either setting up logdir or work_dir makes the system start.

$ sudo grep work_dir /etc/pgpool2/pgpool.conf
work_dir = '/var/log/postgresql'

$ sudo grep logdir /etc/pgpool2/pgpool.conf
#logdir = '/var/log/postgresql'


$ sudo -u postgres /usr/sbin/pgpool -n -d  
2026-01-26 15:31:03.400: main pid 1198: WARNING:  logdir is changed to work_dir
2026-01-26 15:31:03.400: main pid 1198: DETAIL:  if logdir is specified, the value will be set to work_dir
2026-01-26 15:31:03.401: main pid 1198: DEBUG:  initializing pool configuration
...
026-01-26 15:31:23.782: sr_check_worker pid 1235: DEBUG:  node status[0]: 1
2026-01-26 15:31:23.782: sr_check_worker pid 1235: DEBUG:  node status[1]: 2
2026-01-26 15:31:23.782: sr_check_worker pid 1235: DEBUG:  node status[2]: 2
2026-01-26 15:31:23.783: sr_check_worker pid 1235: DEBUG:  pool_release_follow_primary_lock called

Am I misunderstanding the usage of work_dir? It seems to me it is not set to /tmp if omitted from the configuration, as well as using logdir still works.
This is from Ubuntu packaged PgPool-II, if that matters.