I think the problem is due to the fact that apt-rdepends follows the AptPkg enumerator internal values (1,2 3, etc, see the AptPkg man page), not their value. For instance the following command will correctly show Depends, PreDepends and Recommends:
apt-rdepends --follow=1,2,4 --show=1,2,4 xubuntu-desktop
This needs forwarding to Debian.
I think the problem is due to the fact that apt-rdepends follows the AptPkg enumerator internal values (1,2 3, etc, see the AptPkg man page), not their value.
For instance the following command will correctly show Depends, PreDepends and Recommends:
apt-rdepends --follow=1,2,4 --show=1,2,4 xubuntu-desktop
This needs forwarding to Debian.