Yes, it works now. Thanks for your advice.
Well, same issue here. I would say that this has to be fixed somehow. I’m also on Twenty Seventeen theme and I suppose that demo will work with Gutenberg seamlessly. My WordPress installation is brand-new from docker repo. Missing something on demo page feels like a half-product. Maybe there is something I did wrong that the demo is corrupted. Please let me know. Thanks. Gutenberg is a great plugin, anyway. Love to work with it. Dropping my Microsoft OneNote App. 😉 Nice job!