As@tao mentioned, let me post the solution here.
Problem Reason:
HMS Core Push kit earlier than 5.3.0.304 version、Analytics Kit earlier than 6.0.0.301 version and Account kit earlier than 5.3.0.305 version contain the Implicit PendingIntent issue.
Solution:
Push Kit SDK version 5.3.0.304、Analytics Kit SDK version 6.0.0.301 and
Account kit SDK version 5.3.0.305 have been released and fixed the Implicit PendingIntent issue. They've been tested and verified by developers and can be approved by Google for release.
If you are currently using the plug-in(such as React Native, Cordova, Ionic,Flutter), Before the new version of those plug-in released, Huawei also provide a workaround solution(By manually changing the version number).
The following describes the modification method (based on the 5.x plug-in):
After the HMS Core plug-in is installed in the RN, the plug-in package is stored in node_modules/@hmscore.

You need to modify the build.gradle
file in the node_modules/@hmscore/react-native-hms-account/android directory (taking the Account Kit plug-in as an example):
Open the build.gradle
file and change the SDK version in dependencies.
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'com.facebook.react:react-native:+' // From node_modules
implementation 'com.huawei.hms:hwid:5.0.3.302'
}
After the update, run the following command to start compilation again. The plug-in downloads the new SDK:
react-native run-android
If you have installed the plugin as Huawei document describred, the plugin should be saved in node_modules/@hmscore folder.

You need to modify the plugin.xml
file in the node_modules/@hmscore/cordova-plugin-hms-push
directory. (The following uses the Push Kit plug-in as an example)
Open the Plugin.xml
file, search for the keyword framework
, and find the SDK to be modified.
<framework src="androidx.core:core:1.3.1"/>
<framework src="com.facebook.fresco:fresco:2.2.0"/>
<framework src="com.huawei.hms:push:5.0.2.301" />
<framework src="resources/plugin.gradle" custom="true" type="gradleReference"/>
Change the version number to the new one and save it.
Go back to the application root directory and delete the platforms/android
and plugins/cordova-plugin-hms-push
folder.

Run the following command in the root directory:
Cordova:
cordova platform add android
cordova run android --device
Ionic(Cordova):
ionic cordova platform add android
ionic build
ionic cordova run android --device
Ionic (Capacitor) operates in different ways:
①. Delete the capacitor-cordova-android-plugins
folder from the android directory.

②. Modify the plugin.xml
file according to the description in step 2.
③. Run the following command:
ionic build
npx cap sync
npx cap open android
④. Recompile in the Android Studio
Summary
The plug-ins above are used in open source mode, so developers can modify them directly.
However, the Xamarin plug-in is published in Nuget Package mode. Therefore, you cannot modify the SDK version. If this problem occurs, please feel free to contact us.