Description of problem:
I am using nis hosted accounts

"userdbctl user <name>" fails on them, later on causing various malfunctions.


Version-Release number of selected component (if applicable):
systemd-251.10-588.fc37.x86_64

How reproducible:
Always.


Steps to Reproduce:
1. Reboot and log in into a local account on a console.

2. Check "userdbctl user <nisuser>" with <name> being a nis-hosted account name.

# userdbctl user <nisuser>
User <nisuser> does not exist

Actual results:

Full log:
# systemctl status systemd-userdbd
● systemd-userdbd.service - User Database Manager
     Loaded: loaded (/usr/lib/systemd/system/systemd-userdbd.service; indirect; preset: disabled)
    Drop-In: /usr/lib/systemd/system/systemd-userdbd.service.d
             └─nss_nis.conf
     Active: active (running) since Sat 2023-01-14 07:25:01 CET; 3min 18s ago
TriggeredBy: ● systemd-userdbd.socket
       Docs: man:systemd-userdbd.service(8)
   Main PID: 1020 (systemd-userdbd)
     Status: "Processing requests..."
      Tasks: 4 (limit: 18267)
     Memory: 4.8M
        CPU: 43ms
     CGroup: /system.slice/systemd-userdbd.service
             ├─1020 /usr/lib/systemd/systemd-userdbd
             ├─1034 systemd-userwork
             ├─1035 systemd-userwork
             └─1036 systemd-userwork

Jan 14 07:25:01 morse systemd[1]: Starting systemd-userdbd.service - User Database Manager...
Jan 14 07:25:01 morse systemd[1]: Started systemd-userdbd.service - User Database Manager.

# id nisuser
uid=1002(nisuser) gid=1004(nisgroup) groups=1004(nisgroup),135(mock)

# userdbctl user nisuser
User nisuser does not exist.

=> userdbctl fails.


Now, restarting systemd-userdbd:

# systemctl restart systemd-userdbd

# userdbctl user nisuser
   User name: nisuser
 Disposition: regular
    Login OK: yes
 Password OK: no (none set)
         UID: 1002
         GID: 1004 (nisgroup)
 Aux. Groups: mock
              nisgroup
   Real Name: NISuser
   Directory: /users/nisuser
     Storage: classic
       Shell: /bin/bash
   Passwords: none
     Service: io.systemd.NameServiceSwitch

=> userdbctl works!

Expected results:
Function.

Additional info:
- This bug cause various breakdowns and malfunctions, esp. after a login into a DE (I am using xfce + x11).

- Due to the fact manually restarting systemd-userdbd after system boot up seems to work-around this issue, I am guessing the cause is a systemd service startup ordering problem.