From 0.78.3 to 0.79.0: iOS app builds but can't launch in debug

[SpaceSimon]

Environment

System:
OS: macOS 15.6.1
CPU: (14) arm64 Apple M4 Pro
Memory: 96.45 MB / 24.00 GB
Shell:
version: "5.9"
path: /bin/zsh
Binaries:
Node:
version: 22.16.0
path: /var/folders/bz/cwj2vxjd28q589lwyh24_05w0000gn/T/yarn--1772748991359-0.7431690513280984/node
Yarn:
version: 1.22.22
path: /var/folders/bz/cwj2vxjd28q589lwyh24_05w0000gn/T/yarn--1772748991359-0.7431690513280984/yarn
npm:
version: 10.9.2
path: /usr/local/bin/npm
Watchman:
version: 2025.06.23.00
path: /opt/homebrew/bin/watchman
Managers:
CocoaPods:
version: 1.16.2
path: /opt/homebrew/bin/pod
SDKs:
iOS SDK:
Platforms:
- DriverKit 24.5
- iOS 18.5
- macOS 15.5
- tvOS 18.5
- visionOS 2.5
- watchOS 11.5
Android SDK: Not Found
IDEs:
Android Studio: 2024.3 AI-243.26053.27.2432.13536105
Xcode:
version: 16.4/16F6
path: /usr/bin/xcodebuild
Languages:
Java:
version: 17.0.15
path: /usr/bin/javac
Ruby:
version: 2.6.10
path: /usr/bin/ruby
npmPackages:
"@react-native-community/cli":
installed: 15.0.1
wanted: 15.0.1
react:
installed: 19.0.0
wanted: 19.0.0
react-native:
installed: 0.79.0
wanted: 0.79.0
react-native-macos: Not Found
npmGlobalPackages:
"react-native": Not Found
Android:
hermesEnabled: true
newArchEnabled: true
iOS:
hermesEnabled: true
newArchEnabled: true

Things I’ve done to figure out my issue

I've used Upgrade Helper but it didn't help. I found out that if I execute the iOS app in release mode instead of debug, it works.

Upgrading version

From 0.78.3 to 0.79.0

Description

The iOS app builds but doesn't start. The Xcode error is:
com.facebook.react.runtime.JavaScript (11): EXC_BAD_ACCESS (code=1, address=0x17)