alarm listener doesn't fire if app is in foreground

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Alarm plugin version
5.0.0-dev.4 and 4.1.1

Describe the bug
If the app is in the foreground when an alarm goes off, I get a notification. But the alarm listener doesn't get triggered. I'm using Alarm.ringStream.stream.listen(openAlarmPage), but that doesn't get triggered when an alarm starts ringing. In the debug console, I do see Flutter was notified that alarm 1 is ringing.

Additional context
I am using firebase cloud messaging and handlers for notifications from that, but they're not firing when an alarm sounds, either (not that I'd expect them too - I'm just adding this in case there's some weird collision there)

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NB the listener fires properly on ipad, AFAICT - it's specifically an android issue.

Because of the new Play Store restrictions, I've got this in my AndroidManifest.xml:

    <uses-permission android:name="android.permission.SCHEDULE_EXACT_ALARM"/>
    <uses-permission android:name="android.permission.USE_EXACT_ALARM" tools:node="remove"
        tools:ignore="ExactAlarm" />
    <uses-permission android:name="android.permission.USE_FULL_SCREEN_INTENT" tools:node="remove" />

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In AlarmPlugin.alarmTriggerApi?.alarmRang(id.toLong()), in debugging, I get:

FlutterError: Unable to establish connection on channel: 'dev.flutter.pigeon.alarm.AlarmTriggerApi.alarmRang'.

from a debugging line I added to check the success of that line