launchpad.packagesets empty with anonymous login

When I log in through the API I only get a list of packagesets if I log in regularly, not when I log in anonymously. This is with launchpadlib 1.5.4 (lucid).

>>> from launchpadlib.launchpad import Launchpad, EDGE_SERVICE_ROOT
>>> my_lp = Launchpad.login_with("test", "edge", "/home/daniel/.launchpadlib/cache")
>>> anon_lp = Launchpad.login_anonymously("test", "edge", "/home/daniel/.launchpadlib/cache")
>>> [b for b in my_lp.packagesets]
[<packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/core>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/core>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/desktop-core>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/desktop-core>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/edubuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/edubuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/dapper/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/hardy/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/intrepid/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/jaunty/kernel>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/kubuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/kubuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/langpack>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/langpack>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/mobile>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/mobile>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/mythbuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/mythbuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/ubuntu-desktop>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/ubuntu-desktop>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/ubuntu-server>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/ubuntu-server>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/ubuntustudio>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/ubuntustudio>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/unr>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/unr>, <packageset at https://api.edge.launchpad.net/beta/package-sets/lucid/xubuntu>, <packageset at https://api.edge.launchpad.net/beta/package-sets/karmic/xubuntu>]
>>> [b for b in anon_lp.packagesets]
[]
>>>