It seems to apply to Apple and MN engine as well. The only difference MN has the issue when zooming out of a bigger size, not the other way around. On this, I could be just imagining things.
The main issue is that the blurriness is visible on both PDFs and excerpts. A couple of screenshots show that zoomed PDFs in a middle range appear to be blurry, while excerpts are blurry when getting / being smaller.
PS: iPad doesn’t appear to have the same issue.