No callbacks when AlarmManager is used

[nucleus-ffm]

Thank you very much for your work. I would like to integrate unifiedPush into my app. In the process, I noticed a critical (for me) error.

It is not possible to use the AlarmManger with the android_alarm_manager_plus plugin and also the unifiedPush Flutter Connector. When adding the AlarmManger to the project, the callback functions e.g. "onNewEndpoint" are not called anymore.

How to reproduce the problem:

• Create a new project with working Flutter connector (tested with the sample app).
• add the android alarm manager plugin (tested with the version 2.1.2)
• initialize the alarm manager
• try to use the callback function, e.g. to register a new endpoint

At the moment I have no idea where exactly the problem is and how to fix it.

[p1gp1g]

Do you know if the alarm manager works when UnifiedPush is initialized ?

[p1gp1g]

Following some tests, UnifiedPush does not work as soon as new FlutterEngine(context) (FlutterBackgroundExecutor.java#startBackgroundIsolate) is called