CocoaPods Error: Unable to find compatibility version string for object version '70' after adding Share Extension

I'm getting this error when trying to run pod install after adding a Share Extension to my Flutter iOS project:

CopyArgumentError - [Xcodeproj] Unable to find compatibility version string for object version 70.

Environment:

• CocoaPods: 1.16.2
• Xcode: 16.1
• macOS: 15.0.1
• Flutter project

My Podfile:

rubyCopyENV['COCOAPODS_DISABLE_STATS'] = 'true'

def flutter_root
  generated_xcode_build_settings_path = File.expand_path(File.join('..', 'Flutter', 'Generated.xcconfig'), __FILE__)
  unless File.exist?(generated_xcode_build_settings_path)
    raise "#{generated_xcode_build_settings_path} must exist. If you're running pod install manually, make sure flutter pub get is executed first"
  end

  File.foreach(generated_xcode_build_settings_path) do |line|
    matches = line.match(/FLUTTER_ROOT\=(.*)/)
    return matches[1].strip if matches
  end
  raise "FLUTTER_ROOT not found in #{generated_xcode_build_settings_path}"
end

require File.expand_path(File.join('packages', 'flutter_tools', 'bin', 'podhelper'), flutter_root)

platform :ios, '13.0'

flutter_ios_podfile_setup

target 'Runner' do
  use_frameworks!
  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

target 'Share Extension' do
  use_frameworks!
  flutter_install_all_ios_pods File.dirname(File.realpath(__FILE__))
end

Steps to reproduce:

• Working Flutter iOS project with pods installed
• Added Share Extension target in Xcode
• Added Share Extension target to Podfile
• Run pod install -> Error occurs

Things tried:

• Deleting Pods/, Podfile.lock, Runner.xcworkspace
• Different Podfile configurations
• pod deintegrate and reinstall
• Removing and re-adding Share Extension
• Downgrading CocoaPods

The project works fine without Share Extension, I've removed it and added it multiple tiles. Any ideas how to resolve this?