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According to the documentation for Int32.TryParse, if the method returns false, it will set the out parameter to zero. I do not see a similar guarantee for Enum.TryParse in its documentation. It seems that there ought to be such a guarantee, because the method has to set the out parameter to something, and zero makes the most sense.
Is the guarantee specified or documented somewhere else, or is there really no guarantee?
I don’t expect it to be guaranteed to be be anything more specific than “something”. Since documentation does not specify otherwise (and it is the only official documentation) just use return value, but ignore out parameter if return is false.
Side note: I think it is wrong that Int32.TryParse specifies what out parameter is set to if parsing failed as one should make own decisions what “not really a number” means in each particular case… But it is my personal opinion.