Mostly issue seems to be with base href.

Reasons Why Ionic Angular Components Don’t Render in APK

• Wrong <base href="/"> configuration → Change it to <base href="./"> in index.html

• Outdated Android System WebView → Update WebView on the device

• Using browser-only APIs like window, document, localStorage, fetch directly → Wrap with platform checks

• Missing global styles or CSS imports → Ensure global.scss and Ionic CSS are included in angular.json

• Lazy-loaded modules or case-sensitive import paths breaking in APK build

• Required permissions not granted (camera, storage, etc.) so components depending on them silently fail