In the backend, the Portfolios, Posts, Sliders, and Testimonial pattern previews are not showing (see attached screenshots0. All the others show previews.
Thanks for reaching out! The previews for those patterns will not show unless you imported demo content, since those patterns are set to display post content from the demo. However, they will still work. You will just need to edit the post selection for the block by clicking the pencil “Edit” icon after adding to your content.