Крэш на Андроиде при вызове FlutterEngine.destroy из фонового сервиса

[alod2019]

В приложении реализована фоновая обработка событий как описано в Background processes и в ходе которой создается отдельный FlutterEngine и потом, после обработки события. уничтожается. Проблема в том, что при этом возникает крэш

Caused by java.lang.NullPointerException: Attempt to invoke virtual method 'void x6.k.e(x6.k$c)' on a null object reference
       at com.unact.yandexmapkit.full.InitFull.teardownChannels(InitFull.java:1)
       at com.unact.yandexmapkit.full.InitFull.onDetachedFromEngine(InitFull.java:1)
       at com.unact.yandexmapkit.YandexMapkitPlugin.onDetachedFromEngine(YandexMapkitPlugin.java:3)
       at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(FlutterEngineConnectionRegistry.java:1)
       at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(FlutterEngineConnectionRegistry.java:1)
       at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.removeAll(FlutterEngineConnectionRegistry.java:1)
       at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.destroy(FlutterEngineConnectionRegistry.java:1)
       at io.flutter.embedding.engine.FlutterEngine.destroy(FlutterEngine.java:1)

Приложение собрано Flutter 3.19.6

[alod2019]

Проблема возникла после обновления с версии 4.0.2 на 4.1.0 и, похоже, из-за того, что YandexMapkitPlugin теперь реализован через синглтон BuildConfig.YANDEX_MAPKIT_INIT, а раньше внутри плагина создавался отдельный инстанс variantInit, было

public class YandexMapkitPlugin implements FlutterPlugin, ActivityAware {
  private final Init variantInit;

  public YandexMapkitPlugin() throws IllegalAccessException, InstantiationException {
    this.variantInit = (Init) BuildConfig.YANDEX_MAPKIT_INIT_CLASS.newInstance();
  }

  @Override
  public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
    variantInit.onAttachedToEngine(binding);
  }

стало

public class YandexMapkitPlugin implements FlutterPlugin, ActivityAware {

  @Override
  public void onAttachedToEngine(@NonNull FlutterPluginBinding binding) {
    BuildConfig.YANDEX_MAPKIT_INIT.onAttachedToEngine(binding);
  }

и если FlutterEngine-ов больше одного, то после уничтожения олного из них программа падает при уничтожении другого

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void io.flutter.plugin.common.MethodChannel.setMethodCallHandler(io.flutter.plugin.common.MethodChannel$MethodCallHandler)' on a null object reference
    at com.unact.yandexmapkit.full.InitFull.teardownChannels(InitFull.java:62)
    at com.unact.yandexmapkit.full.InitFull.onDetachedFromEngine(InitFull.java:35)
    at com.unact.yandexmapkit.YandexMapkitPlugin.onDetachedFromEngine(YandexMapkitPlugin.java:18)
    at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(FlutterEngineConnectionRegistry.java:272)
    at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.remove(FlutterEngineConnectionRegistry.java:280)
    at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.removeAll(FlutterEngineConnectionRegistry.java:288)
    at io.flutter.embedding.engine.FlutterEngineConnectionRegistry.destroy(FlutterEngineConnectionRegistry.java:123)
    at io.flutter.embedding.engine.FlutterEngine.destroy(FlutterEngine.java:467)
    at io.flutter.embedding.android.FlutterActivityAndFragmentDelegate.onDetach(FlutterActivityAndFragmentDelegate.java:752)
    at io.flutter.embedding.android.FlutterActivity.onDestroy(FlutterActivity.java:875)