An explicit demo startup no longer saves the session, so the demo cannot replace the last visit's project. The config request is aborted after 5 s, stops reading once the body passes the size limit, and is skipped for ?empty and ?demo. The packaged hosting notes link to the published docs.
A startup key (last, empty or demo) chooses the project the page opens on load. empty restores the last visit's project and otherwise starts blank, never with the demo; demo always opens the demo project; last, or no key, is the current behaviour. ?empty and ?demo still win. The config file is fetched once per page load and the service worker never caches it.
G.J.R. Timmer