App misbehaves when installed on the SD card (completion not working)

I've begun experimenting with your very useful app and it might be that I've simply missed something.

I have a Lenovo Tab P11 Plus tablet running android 12.

I've successfully fiddled about with the various settings and all seems fine but with one (important) exception.

Testing it out I have the alerts working, sound, vibration and notification banner - all fine. But when the reminder notification displays with the two options - snooze or completed I find that selecting the 'snooze' reflects OK in the app with a 30 minute extension shown. But, when selecting 'completed' the app is unaltered still showing the task as 'live' without any indication of 'completed'.

Several times I've had a system popup stating the app had stopped working, when in fact it carried on apparently OK.

I've tried reinstalling the app.

As I mentioned, have I missed something?

UPDATE: The app downloaded by default onto my SD card. Moving it to internal storage solved it!!

No files, tests, or entry points are named. Start by reproducing completion from a notification while the app is installed on an SD card, then compare with internal storage; done would be preserving the completed state without the app stopping.