[Due for payment 2026-04-30] Onboarding - Onboarding slides are overlapped by the notch on landscape

[nlemma]

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Version Number: 9.3.54-0
Reproducible in staging?: Yes
Reproducible in production?: N/A - new feature, doesn't exist in prod
If this was caught during regression testing, add the test name, ID and link from BrowserStack: #85229
Email or phone of affected tester (no customers): gatantm+6428@gmail.com but new needed
Issue reported by: Applause Internal Team
Bug source: Exploratory - Significant User Experience Deterioration
Device used: iPhone 12.mini, iOS 16.7
App Component: Other

Action Performed:

1. Launch the app on landscape mode (sign out if logged in)
2. Add an email not signed up and and reach the home page

Expected Result:

Onboarding flow is shown without any overlapping

Actual Result:

The page is cut from the notch on the left

Workaround:

Unknown

Platforms:

• Android: App
• Android: mWeb Chrome
• iOS: App
• iOS: mWeb Safari
• iOS: mWeb Chrome
• Windows: Chrome
• MacOS: Chrome / Safari

Screenshots/Videos

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Issue Owner

Current Issue Owner: @mallenexpensify

[melvin-bot]

@mjasikowski recently merged #85229, but they are OOO right now, so I'll auto-assign someone else.

[melvin-bot]

Triggered auto assignment to @arosiclair (DeployBlockerCash), see https://stackoverflowteams.com/c/expensify/questions/9980/ for more details.

[melvin-bot]

💬 A slack conversation has been started in #expensify-open-source

[github-actions]

👋 Friendly reminder that deploy blockers are time-sensitive ⏱ issues! Check out the open `StagingDeployCash` deploy checklist to see the list of PRs included in this release, then work quickly to do one of the following:

1. Identify the pull request that introduced this issue and revert it.
2. Find someone who can quickly fix the issue.
3. Fix the issue yourself.

[OSBotify]

Investigation Summary: Frontend bug. Causing PR: #85229 (Unlock landscape mode by @GCyganek, High confidence). Recommendation: REVERT. PR #85229 introduced landscape mode support and directly caused this regression - the onboarding flow cut by the notch on the left is a safe area inset handling issue. Assigned: @GCyganek (author), @mjasikowski @rushatgabhane @truph01 (approving reviewers). Labels: DeployBlockerCash kept. Evidence: PR merged same day bug reported (2026-04-07), bug is iOS-only in landscape mode which is exactly what PR modifies, PR modifies BaseOnboardingWorkspaceOptional.tsx (36 add/32 del) and deletes SafeArea/index.ios.tsx replacing it with index.native.tsx. Root cause: new native SafeArea implementation changed left/right inset handling in landscape mode, defaultModalContainer style does not account for horizontal safe area insets, causing notch to cut into onboarding content on iPhone 12 mini iOS 16.7.