We’re debugging a React Native Android app where the first screen should always be login (unauthenticated users).

Expected flow:

first_open
→ splash_screen_viewed
→ splash_screen_unauthenticated
→ splash_redirect_login
→ login_screen_viewed

Observed (from first_open users)

• splash_screen_viewed → ~95%

• splash_screen_unauthenticated → ~93%

• splash_redirect_login → ~80%

• login_screen_viewed → ~80%

Key issue

~20% users fire first_open but never reach login.

For these users:

• No login_screen_viewed

• No later events (login, onboarding, etc.)

So this doesn’t look like just a missing analytics event — looks like users are dropping during app startup.

Setup

• React Native (Android)

• Firebase / GA events

• Simple logic: splash → check auth → redirect to login

Question

What could cause users to fire first_open but not reach the first screen?

Specifically, should we look into:

• JS bundle not loading / app init failure?

• Navigation race condition?

• Auth state resolution hanging?

• App killed/backgrounded during cold start?

• Analytics timing (events firing too early)?

Also, what’s the best way to debug this stage reliably?