Expected behavior: When swiping "back" on the main/posts page, expect to see "Are you sure you want to exit? Y/N"-type notification. "No" will return you to the app, whereas "Yes" will "close" the app (as in, reopening the app is a fresh open, not 'pick up where you left off'/minimize)
Observed behavior: Swiping "back" on the main/posts page just minimizes the app
For what it's worth, I did my best to "fine-tooth comb" through the settings, and nothing else looked obviously out of place