Failing to connect to Metro on iOS 14 and Big Sur

Description

My RN app sometimes decides to connect to Metro, sometimes not and still works (but with incredibly long load times), and sometimes it just crashes - it’s totally random. Same when using react-native run ios --device and Xcode (it’s definitely in the Debug scheme). I suspect it has something to do with iOS 14 permissioning - when it does work, it happens after clicking Allow to accessing other network devices and force quit/opening the app. I’ve looked through console logs and am not closer to figuring out why this is happening.

Running iOS 14.0.1, macOS 11 beta 8 (20A5374i).

React Native version:

For some reason react-native isn’t recognising my local settings, so also attached an excerpt of my package.json.

  "dependencies": {
    "react": "16.13.1",
    "react-native": "0.63.3",
  },

System:
    OS: macOS 11.0
    CPU: (16) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 741.13 MB / 16.00 GB
    Shell: 5.8 - /bin/zsh
  Binaries:
    Node: 12.18.1 - ~/.nvm/versions/node/v12.18.1/bin/node
    Yarn: 1.22.5 - /usr/local/bin/yarn
    npm: 6.14.5 - ~/.nvm/versions/node/v12.18.1/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  Managers:
    CocoaPods: 1.9.1 - /usr/local/bin/pod
  SDKs:
    iOS SDK:
      Platforms: iOS 14.0, DriverKit 19.0, macOS 10.15, tvOS 14.0, watchOS 7.0
    Android SDK:
      API Levels: 28, 29
      Build Tools: 28.0.3, 29.0.2, 29.0.3
      System Images: android-29 | Google APIs Intel x86 Atom
      Android NDK: Not Found
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.6010548
    Xcode: 12.0/12A7209 - /usr/bin/xcodebuild
  Languages:
    Java: 1.8.0_251 - /Users/lucas/.jenv/shims/javac
    Python: 3.8.5 - /usr/local/opt/python/libexec/bin/python
  npmPackages:
    @react-native-community/cli: Not Found
    react: Not Found
    react-native: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps To Reproduce

Again, this is hard to do as it’s a random occurrence.

Expected Results

The app not to crash.

Snack, code example, screenshot, or link to a repository:

Again, this is hard to do as it’s a random occurrence.