Deinitialize in onDetachedFromEngine on Android, foreground service problem

[Ilya-Vys]

Describe the bug
We need to have ble connection on foreground service, to get actual data even app is terminated.
5.0.3 version unclude feature #519
This feature close our foreground service connection when app terminated by user or system.

To Reproduce
Open connection on foreground service.
Terminate app.

Expected behavior
Do not close foreground service connection.

Smartphone / tablet
Android devices

Peripheral device
Custom BLE device

Additional context
Foreground service and app have different instances of FlutterReactiveBle, cause service works on isolate. Why instance on service closing? How to solve it properly?