[Bug]: java.lang.IllegalStateException - The requested cached FlutterEngine did not exist in the FlutterEngineCache: 'flutter_boost_default_engine'

### 请描述遇到的问题，以及您所期望的正确的结果

不报错。

### 请说明如何操作会遇到上述问题

FireBase上监控捕获的。android手机系统版本：12，机型：Honor GIA-AN00

出现频率：偶现

初始化时机：Application onCreate

### 在下面填入关键复现代码

```
io.flutter.embedding.android.j.e (未知来源:46)
io.flutter.embedding.android.FlutterActivity.onCreate (未知来源:36)
com.idlefish.flutterboost.containers.FlutterBoostActivity.onCreate (未知来源:43)
com.teo.hopegoo.flutter.route.HGBoostActivity.onCreate
android.app.Activity.performCreate (Activity.java:8419)
android.app.Activity.performCreate (Activity.java:8391)
android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1343)
android.app.ActivityThread.performLaunchActivity (ActivityThread.java:4285)
android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:4517)
android.app.servertransaction.LaunchActivityItem.execute (LaunchActivityItem.java:111)
android.app.servertransaction.TransactionExecutor.executeCallbacks (TransactionExecutor.java:149)
android.app.servertransaction.TransactionExecutor.execute (TransactionExecutor.java:103)
android.app.ActivityThread$H.handleMessage (ActivityThread.java:2692)
android.os.Handler.dispatchMessage (Handler.java:109)
android.os.Looper.loopOnce (Looper.java:206)
android.os.Looper.loop (Looper.java:296)
android.app.ActivityThread.main (ActivityThread.java:9024)
java.lang.reflect.Method.invoke (Method.java)
com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run (RuntimeInit.java:569)
com.android.internal.os.ZygoteInit.main (ZygoteInit.java:976)
```

### 复现的平台

Android

### Flutter SDK版本

3.27.4

### FlutterBoost版本

5.0.2

### 是否延迟初始化FlutterBoost

No

### 解决方案

Start with FlutterBoostActivity.onCreate and the FlutterEngineCache lookup shown in the stack trace, then compare it with FlutterBoost initialization in Application.onCreate. Investigate why flutter_boost_default_engine is absent on Android 12 with Flutter 3.27.4 and FlutterBoost 5.0.2. Done means identifying a reproducible lifecycle cause and documenting a verified fix or regression test.

Written by the indexing model from the issue text.