There are no headless sessions on Wayland. At all.
You want proper headless session, set up X11 distro and use xrdp - it's really easy. But on wayland "remote support" to something that is already displayed on screen is all you can get now.
What I want is to be able to start a session remotely after a reboot, and continue that same session when I get back home. And conversely start a session while at my desk at home and resume that same session remotely. Without any weird limitations.
In other words, how RDP works on Windows.
So you're saying that is still not possible I take it.
I tried some solutions in the past but they did not support that, which is a deal breaker.