Describe the bug
After installing TigerVNC 1.15 on SUSE 16, it fails to start.

2025-11-06T14:21:36.617055+08:00 hanabox vncsession[2334]: pam_unix(tigervnc:session): session opened for user root(uid=0) by root(uid=0)
2025-11-06T14:21:36.635474+08:00 hanabox vncsession[2334]: vncsession: vncserver exited with status=255
2025-11-06T14:21:36.636364+08:00 hanabox vncsession[2334]: pam_unix(tigervnc:session): session closed for user root
2025-11-06T14:21:36.637333+08:00 hanabox systemd[1]: vncserver@:16.service: Deactivated successfully.

To Reproduce
Steps to reproduce the behavior:
The vncserver.users is configured as: 16=root
The content of vncserver-config-defaults is as follows:

session=gnome
securitytypes=vncauth,tlsvnc
geometry=2000x1200
localhost
alwaysshared

vncpasswd has also been executed, and a password has been generated.

Expected behavior

Screenshots

Additional context
Add any other context about the problem here.