Such doctrines have yet to be formally defined. Nevertheless, I would expect a Catholic to regard them as true, and to act accordingly. Concerning Mary, for example, there is the dogma - ‘senta certa’ - that being the ‘Mother of God (she) is entitled to the Cult of Hyperdulia’ (‘Fundamentals of Catholic Dogma’). As you know, in practice, this form of special veneration is what she is, indeed, given.