The Window Manager Lied Politely How START_SUCCESS quietly sent my activity to the wrong pane — and why setLaunchDisplayId() is only half the address. Android Automotive System Internals — Part …

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A deep-dive into a silent Android Automotive OS (AAOS) bug where activities launched with `setLaunchDisplayId()` land in the wrong pane on multi-pane center consoles. The root cause is the `TaskDisplayArea` (TDA) layer introduced in Android 12, which sits between `DisplayContent` and `Task`. `setLaunchDisplayId()` only routes to the display, not the specific pane — the framework silently falls back to `getDefaultTaskDisplayArea()`, returning `START_SUCCESS` regardless. The fix for Android 12–14 is `CarActivityManager.setPersistentActivity()` with the correct TDA feature ID. Android 16 introduces the `TaskPanel` model via Scalable UI. Diagnostic commands using `adb shell dumpsys` are provided to confirm the bug and identify the correct `featureId` values.