+%if %{enable_wayland}
+# gdm doesn't show 2 desktop files with the same name
+unlink %{buildroot}%{_datadir}/wayland-sessions/enlightenment.desktop
+cp %{buildroot}%{_datadir}/xsessions/enlightenment.desktop \
+ %{buildroot}%{_datadir}/wayland-sessions/enlightenment-wayland.desktop
+%endif

That's intentional for GDM: the 'wayland session' overrules the xorg session, unless if GDMruns in X Mode (then the wayland session is ignored)

Having two session .desktop files with different filename but with the same Name: does not sound very user-friendly: the user won't be able to distinguish them.