I also got the impression recently that things that were fixed in 2.2.1 do not work in 2.2.2 anymore, i.e. the problem with the checkboxes field. With the 2.2.2 testkit, however, the structure field seems to work fine.
Oh, I just saw you deleted your last post again, so it is not working with 2.2.1?
Edit: Plugins: I meant custom additions to the panel, Kirby stuff should not get loaded in the panel.