Go to insecure staging: http://test.archiveofourown.org
Log out to ensure you're accessing works in chapter-by-chapter mode
Find and access a multi-chapter work, and double check that you are still on the insecure site
Open the Chapter Index, choose a chapter using the select menu, and press "Go"
You are taken to the chapter, but on https://test.archiveofourown.org – the secure site. This is a problem if you're on an older device and can't access the secure site.
You should stay on the insecure site.