This could potentially be related to a script within the app, particularly if it's trying to upload dates for trash collection as you mentioned.
One potential solution you can try is to force quit the Agenda app and then relaunch it. To force quit an app on macOS, you can use the "Force Quit" option from the Apple menu or press Command + Option + Escape keys together to bring up the Force Quit Applications window. From there, select the Agenda app and click on the "Force Quit" button.
After force quitting the app, try launching it again to see if it resolves the hanging issue. If the problem persists, you may need to consider other troubleshooting steps such as reinstalling the app, checking for any available updates for macOS and the Agenda app, or reaching out to the developer for support.
Additionally, since you mentioned sending forced stop reports to Apple without any response, you may want to explore other avenues for seeking assistance. This could include reaching out to the developer of the Agenda app directly through their support channels or forums, as they may have more specific insights or solutions to offer for this issue.