[Bug]: Keyboard pushes WebView up and scroll triggers back navigation on Android 16 (edge-to-edge enforcement)

[theoryinsights-ops]

Capacitor Version

Device: Google Pixel 9 Pro XL, Android 16 (SDK 36)
Capacitor 8
Two symptoms: (1) keyboard opening pushes the entire screen up, (2) scrolling down inside a form dismisses the screen and navigates back
Already tried without success: adjustPan in AndroidManifest, @capawesome/capacitor-android-edge-to-edge-support, @capacitor-community/safe-area, WindowCompat.setDecorFitsSystemWindows, Keyboard: { resizeOnFullScreen: false }, captureInput: true, adjustMarginsForEdgeToEdge: force
Related issues: #7983, #8166, #8214

Other API Details

Platforms Affected

• iOS
• Android
• Web

Current Behavior

Device: Google Pixel 9 Pro XL, Android 16 (SDK 36)
Capacitor 8
Two symptoms: (1) keyboard opening pushes the entire screen up, (2) scrolling down inside a form dismisses the screen and navigates back
Already tried without success: adjustPan in AndroidManifest, @capawesome/capacitor-android-edge-to-edge-support, @capacitor-community/safe-area, WindowCompat.setDecorFitsSystemWindows, Keyboard: { resizeOnFullScreen: false }, captureInput: true, adjustMarginsForEdgeToEdge: force
Related issues: #7983, #8166, #8214

Expected Behavior

When a user taps an input field and the soft keyboard opens, the screen should remain in place — it should not shift, jump, or push content upward. The user should be able to scroll within the form normally without triggering back navigation. This behavior works correctly on Android 14 and below.

Project Reproduction

N/A — reproducible in any Capacitor 8 app targeting Android 16 (SDK 36) with edge-to-edge enforced. The issue occurs when tapping any input field inside a position: fixed fullscreen overlay component while running on a physical Pixel 9 Pro XL with Android 16.

Additional Information

No response

[theoryinsights-ops]

Update:
Original symptoms (signup screen only):

Keyboard opening pushed the entire screen up
Scrolling down inside the form triggered back navigation

What we tried that did NOT work: adjustPan in AndroidManifest, WindowCompat.setDecorFitsSystemWindows, EdgeToEdge.enable(this), @capawesome/capacitor-android-edge-to-edge-support, adjustMarginsForEdgeToEdge: 'force', resizeOnFullScreen: false, captureInput: true, viewport-fit=cover.

What caused a full regression: Installing @capacitor-community/safe-area@8.0.1 without EdgeToEdge.enable(this) active in MainActivity.java crashed the Capacitor bridge on every screen with Cannot read properties of undefined (reading 'triggerEvent'). Uninstalling it restored all screens.

Current working state: MainActivity.java has only setTextZoom(100). AndroidManifest.xml still has adjustResize (original, never changed). capacitor.config.ts has captureInput: true and resizeOnFullScreen: false. Both the original signup bugs and the regression are fully resolved.

Caveat: We were also using an AI builder hat was pushing React component changes to the repo concurrently. We cannot confirm whether the signup keyboard issue resolved from the package uninstall, a component-level change, or both. Posting here in case the combination is useful to others hitting the same wall on Android 16.