That’s really unlucky it seems it’s the compositor that’s causing your blackout. Because when you have it disabled everything works.
I don’t think anything did but don’t know if something small did change which might have caused your issue.
You can use this post. It’s mainly written for KVM but the steps under " Installing and enabling picom" is the same for a normal desktop. Remember to disable the default xfwm4 before installing picom.