The strange thing is that if i try to do the same thing (enable this behavior with install profile) for Document, this one works like a charm.
I suppose that there is something wrong in my content-type registration because for standard types i don't have problems, but i can't find the problem..any idea?
I know, and it's strange because plone.dexterity should be registered (otherwise nothing will work)..i'm on a Plone 5.1 btw.
Reinstalling my dx-addon, the content-type returns available.
I made some other tests and on a new clean site, i don't have this kind of problem.
I think that i fucked up something in my development site that makes this inconsistent situation reinstalling my addon with behavior.