Around the date below, insserv-compat became an unneeded package, according to
zypper, so I have removed it.

jun 29 13:46:23 display-manager[1291]: /usr/lib/X11/display-manager: line 16:
/etc/rc.status: No such file or directory
jun 29 13:46:23 display-manager[1294]: /usr/lib/X11/display-manager: line 159:
rc_reset: command not found

The system boots to desktop, but display-manager.service is marked as failed.

>From xdm.changes:

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Mon Jun 22 18:56:47 UTC 2020 - Cristian Rodr�guez <crrodriguez@opensuse.org>

- Require fillup_prereq not insserv-compat when using systemd 

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Bug ID	1174180
Summary	display-manager.service: /etc/rc.status: No such file or directory
Classification	openSUSE
Product	openSUSE Tumbleweed
Version	Current
Hardware	Other
OS	Other
Status	NEW
Severity	Normal
Priority	P5 - None
Component	X.Org
Assignee	gfx-bugs@suse.de
Reporter	beppe85@gmail.com
QA Contact	gfx-bugs@suse.de
Found By	---
Blocker	---