Hello,
Yes, they can certainly make errors. The canon lawyer to whom you refer did not say that the marriage “automatically (becomes) valid…” She said it would “automatically be considered valid.” While I might quibble with that phrasing (see below), that is not the same as what you said she said.
I cannot really provide handy links or text to support the conclusion of “SerraSemper”, “1ke” and Dr. Peters. But, I can refer to the 2001 edition of the Canon Law Society of America’s “Roman Replies and Advisory Opinions,” pp. 114-118, for two more opinions in line with Dr. Peters, et al. Also, p. 1287 of the CLSA’s “Green Commentary” has a brief word about this issue.
I would only ask: if the OP’s first marriage is declared invalid–something which hasn’t happened yet, I agree–how could she have ever been impeded by the bond of that marriage? It seems to me that if the first marriage is declared invalid, there was no marriage, ever. There was no bond, ever. There was no impediment, ever. The OP was free to marry “again” and did so according to the law to which she was subject (including divine law, by the way). If we follow your line of reasoning, it seems we have to conclude that a declaration of nullity **makes **a person free to marry, from the moment it is declared. This pernicious notion, as I called it earlier, has to be eliminated.
What follows is the aforementioned “quibble.” Maybe it is not really a quibble–I don’t disagree with the substance of what SerraSemper said. Let’s just call it my attempt at contextulization. It is not of great value but since I wrote it, I won’t delete it…
A presumption of validity arises when a person exchanges marital consent in accord with whatever “form” is required of him/her. For non-Catholics and non-Orthodox, that “form” is whatever the civil law requires. In the scenario presented in this thread, you might say there are two competing presumptions of validity for the OP’s two exchanges of consent. This is from a strictly legal perspective, reflecting how a tribunal deals with those with multiple marriages or those who marry someone who was previously married. In the “real world” we automatically say “Hey, you were married before. You can’t get married again.” That is true and reflects the totality of c. 1085. But, if somebody goes ahead and marries a second time in accord with appropriate form, then it is discovered that the first marriage was actually invalid, the only conclusion we can come to is to continue to presume that the “second marriage” is, and always was, valid. There are no longer any competing presumptions–only one remains and it is now more solid. That is how I try to make legal sense of the convoluted messes people get themselves into, and ask us in the Tribunal to sort out…
Dan