Here's a link docuмenting five Eucharistic Miracles.
https://www.churchpop.com/2015/06/28/5-extraordinary-eucharistic-miracles-with-pictures/ Four, I believe, were in the traditional Mass (earlier centuries) and one was with a Priest ordained in the new rite.
Transubstantiation is a Miracle requiring the Power of God Himself. The devil can no more transubstantiate than he can create. I have a book by Fr. Mueller (before photographic/dna evidence etc, but based on eyewitness testimony) where Father says these Eucharistic Miracles are reason enough for non-Catholics to join the Church. Father also uses them as proofs of the Real Presence against Protestants. Vatican I says Miracles are supernatural motives of credibility that establish the Truth of the Catholic Religion.
Reason has a role in examining and investigating what has gone wrong in the last 50 years. But Faith is a greater light than reason, and the truths of Faith are more certain than the judgments of reason. If an apparent judgment of reason contradicts a certain truth of Faith, it is the former that is mistaken, not the latter. We will disagree, I suppose, till we have a holy Pope who will settle it.
Our Lady in Quito, Who prophesied these times, spoke of the "Prelate who will restore the spirit of Her Priests", a statement which in its plain sense itself suggests the Priests are not invalid, but have lost their spirit; which, in due time, will be restored by the Holy Pope.
Gladius Veritatis, are you a sedeprivationist? I am speaking of the principle by which we can know one rite is inferior to the other. There is a portion of every sacramental rite essential to validity; the rest, as Fr. G-L explains, belongs to the "integrity". If prayers that compose the integrity of the rite are removed, we can legitimately conclude, I would argue, that such rites are objectively inferior.