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"orientation: portrait" in app.json does not prevent orientation change on iPad- iOS 12.4

See original GitHub issue

🐛 Bug Report

Environment

  Expo CLI 3.0.9 environment info:
    System:
      OS: macOS 10.14.6
      Shell: 5.5.1 - /usr/local/bin/zsh
    Binaries:
      Node: 10.15.3 - /usr/local/bin/node
      Yarn: 1.10.1 - /usr/local/bin/yarn
      npm: 6.10.3 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    IDEs:
      Android Studio: 3.4 AI-183.6156.11.34.5522156
      Xcode: 10.3/10G8 - /usr/bin/xcodebuild
    npmPackages:
      expo: ^34.0.1 => 34.0.4 
      react: 16.8.3 => 16.8.3 
      react-native: https://github.com/expo/react-native/archive/sdk-34.0.0.tar.gz => 0.59.8 
      react-navigation: ^3.11.0 => 3.11.1

Steps to Reproduce

Create template expo app

npm i -g expo-cli@3.0.9
expo init (picking the tabs template)

app.json

{
  "expo": {
    "name": "expo-template",
    "slug": "expo-template",
    "privacy": "public",
    "sdkVersion": "34.0.0",
    "platforms": [
      "ios",
      "android",
      "web"
    ],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/images/icon.png",
    "splash": {
      "image": "./assets/images/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    },
    "updates": {
      "fallbackToCacheTimeout": 0
    },
    "assetBundlePatterns": [
      "**/*"
    ],
    "ios": {
      "supportsTablet": true
    }
  }
}

Start app in portrait orientation on iPad 5th Generation (WiFi) - iOS 12.4
Turn device to landscape orientation

Expected Behavior

Screen should not change orientation

Actual Behavior

Screen does change orientation

Reproducible Demo

Sorry, please dont close this issue, but I can’t work out a way to change the orientation of a snack. If it is possible, please let me know how and I will make one ASAP. 😃