Extra characters added to project.pbxproj file causing iOS build failure when using flutter_launcher_icons

I am using the Flutter Launcher Icons package to generate icons for multiple schemes in my Flutter app. When I run the command:

dart run flutter_launcher_icons

It adds extra characters to the end of the project.pbxproj file located at:

ios/Runner.xcodeproj/project.pbxproj

The extra characters added are:

*/;
}

This causes the Xcode project to be unreadable, resulting in the following error when trying to build the app on iOS:

unable to read project 'Runner.xcodeproj'.
Reason: The project ‘Runner’ is damaged and cannot be opened due to a parse error. Examine the project file for invalid edits or unresolved source control conflicts.

Additionally, when I try to run:

pod install

I receive this error:

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Start by reproducing `dart run flutter_launcher_icons` with multiple schemes, then inspect `ios/Runner.xcodeproj/project.pbxproj` for the reported trailing characters. Confirm the generated project remains parseable and that the iOS build no longer reports a damaged project; investigate the related `pod install` error if it is part of the same failure.

Written by the indexing model from the issue text.