Sounds like that wasn't Tyvek wrap, or it was put on wrong. It would block most moisture but not lock in water vapor as it dried, in theory. Some don't like Tyvek either way, and I wouldn’t know the best house wrap.

Whatever it was, I would hope it was installed wrong. How common that is, unimaginable. People on a homebuilding site who have no idea what they’re doing messing up, that’s easy to imagine. I’ve seen homes where they forgot the moisture protection wrap altogether. That was no doubt a disposable house in the making.

My step father works in commercial construction (30+years). He sees people doing stuff wrong all the time. The site super eventually knows it, but often they just cover it up and leave it.

The companies he works for generally want him to be super on jobs, as he’s often the most qualified, but he doesn't have the patience to deal with the idiots in construction. So he still does the job, but without the title or all the responsibilities.

In a case he became a party to not long ago, a crew poured 1000s of ton of concrete for a nuclear reactor. They didn't follow the very specific procedure for the concrete, and it quickly started to show cracks and signs it would fail.

He made them take it all up and do it the right way, which pissed off a lot of people, but they had no choice. I was impressed that unskilled idiots can even work on pouring nuclear reactor walls, and their incompetence could have caused a national disaster in the years ahead if no one had stepped up.

Had this been a home builder situation, they might have notice the same sort of serious mistakes early on, but for sure would have covered them up and kept on building the house(s). Sure they often know catastrophic failure is inevitable, but it's just a homebuyer that's going to be wrecked. Nobody important to them. They’re building a sale first, a house second.