BUG (?) "Back" behavior from Inbox after opening from notification

When RR notifies user of a new message in their inbox, and the user starts RR via that notification, once they've read the message and want to do something other than directly reply to said message (e.g. look for one of their own comments for reference), the back button exits RR instead of going back to the main interface as one might expect (causing them to have to go find RR on their phone and start it again the long way). If this is intended behavior, then I'd like to at least request an option that it not do so, but instead always go back to the main screen before actually exiting.

Thank you very much both for this very useful app, and for taking the time to read and consider this issue.

No files, tests, or entry points are named. Reproduce the notification-launched Inbox flow and inspect how Android back navigation handles the message screen; clarify whether Back should reach the main interface before exit. Done means the chosen behavior is implemented and verified for that flow.