Went into the snapshot again prior to the update to reproduce the issue and the fix…
I ran the process of my previous post but skipped step 3 and went with the regular gdm this time…
I got the gdm welcome screen, however I wasn’t fully able to login to xfce,
so this time I also opened
/etc/ligthdm/lightdm.conf
and edited these lines
[LightDM]
logind-check-graphical=True
run-directory=/run/lightdm
[Seat:*]
greeter-session=lightdm-gtk-greeter
session-wrapper=/etc/lightdm/Xsession
[XDMCPServer]
[VNCServer]
got the tip from https://forum.manjaro.org/t/loginctl-with-second-seat-leads-to-crash-of-xorg-lightdm/84412/12