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This is related to the following line in plone.app.z3cform.kss.validation:

    formWrapper = getMultiAdapter((context, request), name=formname)

formname is a KSS parameter, set via a kssattr to be view.__name__. view.__name__ is the name of the factory, 
because the (backported) AddViewTraverser does add_view.__name__ = ti.factory.

For this to work, we may need special handling in plone.app.z3cform, since the actual form can't be looked 
up using getMultiAdapter((context, request), name=foo) even with the right name.

Fixed in plone.app.z3cform r26704