There appears to be a bug with the latest version.
Running discourse 3.5.0.beta8-dev (679d51a985)
What’s happening is that when a new topic is opened (Chrome browser on Windows 10), the top row is supposed to have the search bar but it’s missing. If I disable the theme component the default discourse search bar shows up but if the component is enabled, the top search bar is missing AND also the search icon on the top right is missing. If I scroll down one line then the search button shows up on the top right but the search bar never shows up on the top line of a topic.
Configured for Showon top_menu and Plugin outlet on above_main_container. Pretty sure it used to show up on the top row earlier even for topics.
The problem is that until the user scrolls there’s no way to search since both the search icon and search bar are missing. If I disable the theme then the default search bar and icon show up just fine i.e. when the page loads, the search bar shows up and when the user scrolls down one line the search bar disappears and the instead the search icon shows up.