Xfce developer Adlo continues working on rewriting xfwm4-wayland as part of the effort to provide native and clean Wayland support as part of this lightweight, GTK-based desktop environment. Adlo has regularly posted status updates to the Wayland mailing list as part of this effort.
Adlo's latest status update notes:
"Changes in my latest rewrite of xfwm4-wayland:
The Wayland compositor now uses some of xfwm4's original code.
As I have said before, the X11 and Wayland versions of the compositor are now in the same binary and the compositor now uses the wlr-scene API."
Those interested in this Xfce Wayland compositor effort can find more details via GitHub .