BUG #18361: systemd[1]: postgresql-16.service: Killing process 25992 (postgres) with signal SIGKILL.

The following bug has been logged on the website:

Bug reference: 18361
Logged by: Gena Makhomed
Email address: makhomed(at)gmail(dot)com
PostgreSQL version: 16.2
Operating system: Rocky Linux release 9.3
Description:

PostgreSQL 16.2 installed on the Rocky Linux release 9.3 server from
official repository with official instruction from page
/download/linux/redhat/

when I execute command

# systemctl stop postgresql-16.service ; systemctl status
postgresql-16.service

I see, what PostgreSQL 16.2 was killed by SIGKILL.

this is a bug, as I understand, because database will be corrupted.

Is it possible to fix this bug and stop killing PostgreSQL with signal
SIGKILL ?

# systemctl stop postgresql-16.service ; systemctl status
postgresql-16.service
○ postgresql-16.service - PostgreSQL 16 database server
Loaded: loaded (/usr/lib/systemd/system/postgresql-16.service; enabled;
preset: disabled)
Active: inactive (dead) since Sat 2024-02-24 12:47:19 UTC; 6ms ago
Duration: 3.525s
Docs: /docs/16/static/
Process: 26666 ExecStartPre=/usr/pgsql-16/bin/postgresql-16-check-db-dir
${PGDATA} (code=exited, status=0/SUCCESS)
Process: 26671 ExecStart=/usr/pgsql-16/bin/postgres -D ${PGDATA}
(code=exited, status=0/SUCCESS)
Main PID: 26671 (code=exited, status=0/SUCCESS)
CPU: 43ms

Feb 24 12:47:15 postgres-16.example.net systemd[1]: Starting PostgreSQL 16
database server...
Feb 24 12:47:15 postgres-16.example.net postgres[26671]: 2024-02-24
12:47:15.985 UTC [26671] LOG: redirecting log output to logging collector
process
Feb 24 12:47:15 postgres-16.example.net postgres[26671]: 2024-02-24
12:47:15.985 UTC [26671] HINT: Future log output will appear in directory
"log".
Feb 24 12:47:15 postgres-16.example.net systemd[1]: Started PostgreSQL 16
database server.
Feb 24 12:47:19 postgres-16.example.net systemd[1]: Stopping PostgreSQL 16
database server...
Feb 24 12:47:19 postgres-16.example.net systemd[1]: postgresql-16.service:
Killing process 26672 (postgres) with signal SIGKILL.
Feb 24 12:47:19 postgres-16.example.net systemd[1]: postgresql-16.service:
Deactivated successfully.
Feb 24 12:47:19 postgres-16.example.net systemd[1]: Stopped PostgreSQL 16
database server.