The worst pattern I've seen is setting the page height to the viewport height and then placing scrollbars on containers. For example this particular UI library has managed to break print layout and page navigation keys and mouse scrolling until you focus the content div
https://www.skeleton.dev/docs/get-started
I was once guilty of doing this on a site I made but the users called it out so I fixed it. It's another thing for a UI library to spread this pattern.