I can't remember if it was said in this chat either, but there are a couple varients of stock manifolds. Earlier gens had an issue where they would break bolts and warp, the newer ones actually crack and need to be replaced. I have a 2019 Classic, and they cracked... my brothers were the same on his 2019 too. None of our bolts were broken.
I forget the year cutoff where that changed... there is also a "new" manifold that is supposed to fix the cracking issue now, he installed those and I installed the older style so we'll see how things hold up.