OK I found a way to fix it @ package time! I previously built webkitgtk with -DENABLE_X11_TARGET=OFF. I tried building with -DENABLE_X11_TARGET=ON (since this is the major difference between my build and the gnome-build-meta build, aside from Mesa version), and now it works properly
Seems like disabling the x11 backend also accidentally disables parts of the Wayland backend somewhere
OK I found a way to fix it @ package time! I previously built webkitgtk with -DENABLE_ X11_TARGET= OFF. I tried building with -DENABLE_ X11_TARGET= ON (since this is the major difference between my build and the gnome-build-meta build, aside from Mesa version), and now it works properly
Seems like disabling the x11 backend also accidentally disables parts of the Wayland backend somewhere