ITMS-90334 error when executing a Xcode Cloud TestFlight build

When I try to create a TestFlight build of my app using Xcode Cloud, I get a couple of ITMS-90334 errors and the build fails. The error messages look like:

ITMS-90334: Invalid Code Signature Identifier - The identifier 'MySwiftPackage-55554944e95A2da4fe9e3357b44de57c3ba890e8' in your code signature for 'MySwiftPackage_-658550CFFF128C8B_PackageProduct' must match its Bundle Identifier 'MySwiftPackage'

Where MySwiftPackage is a Swift Package which is used by a framework as well as the application. The dependencies look like this:

MyApp
+ MyFramework
  + MySwiftPackage
+ MySwiftPackage

• MyApp is a macOS app
• MyFramework is a mixed Swift and Objective-C framework
• MyApp is also mixed Swift and Objective-C
• When I run an archive build on my local Mac and upload the build to App Store Connect to be used as a TestFlight build, everything seams to be fine and the build is accepted
• I found some discussions on ITMS-90334 but not related to using Swift Packages and Frameworks

Any ideas what might be going on or where I can look to get more info on the nature of ITMS-90334?