Anyway I just read the first one, but I'm aware of these miracles some time ago. I don't think it has outward persuasive powers catholics think they do. It sounds trivial and specific. It's also so clearly some growth to me. You got the wafer, you got contamination, and you put it in a container with water. Of course, then they would find a separate heart tissue to send to the scientists.
(Also unrelated, but it's kinda funny. Catholics would be saying it's the literal body of Christ. And they they dropped it to the floor and went 'well, I can't eat that'.)