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If you are a developer looking to address this bug or explain it to your team, here is a full blog post draft tailored for a technical audience.

Understanding the specific request for "subject 123878" requires looking at the technical landscape, as this number is most prominently associated with a significant framework issue regarding the Material 3 App Bar .

In the transition from Material 2 to Material 3, the way elevation is handled changed significantly. Used shadows to indicate elevation. Material 3: Uses a surface tint color overlay. 123878

You aren't alone. This specific behavior is tracked under in the Flutter GitHub repository (Flutter GitHub). For developers working on API levels above 30, the expected "elevation on scroll" effect often fails to trigger. The Problem: Breaking Down #123878

As noted in the GitHub report, this is particularly prevalent on devices running API 30 and above. Testing on an older emulator can help you confirm if the issue is framework-deep or OS-specific. The Road Ahead If you are a developer looking to address

The bug reported in issue #123878 highlights that on newer Android versions, the app bar elevation change simply doesn't activate when the user scrolls, leaving the UI feeling static and flat. Why It Matters

Instead of relying on the automatic elevation, you can use a NotificationListener to track the scroll position and manually update the elevation or surfaceTintColor property of your AppBar . 2. Force the Surface Tint Used shadows to indicate elevation

It signals to the user that they are currently interacting with a scrollable area.