Unfortunately, I have no huawei with notch right now and I can’t check but this line in AndroidManifest should help :
<meta-data android:name="android.notch_support" android:value="true"/>
You can leave both lines:
<meta-data android:name="android.max_aspect" android:value="2.1" />
<meta-data android:name="android.notch_support" android:value="true"/>
(more information here p4.3)