After facing the black screen issue on specific Android devices (like Oppo Reno 3 Pro), I found that adding two meta-data tags to the AndroidManifest.xml file resolved the issue and allowed the UI to render properly.

Here’s what worked for me:

<meta-data
        android:name="io.flutter.embedding.android.EnableImpeller"
        android:value="false" />

This change worked and now the UI displays correctly on the Oppo Reno 3 Pro and other Android devices.

Special Thanks:

I want to extend my special thanks to Duy Tran for commenting on my question with this helpful link, which provided great insight into Impeller and its effect on Android rendering:

Flutter Impeller Documentation

This documentation was really useful in understanding the issue and how to fix it.