I have had endless trouble with this. You never get any useful guidance as to what you need to do just endless links to endless documents and guidance that all say the same thing but no answer to your issue. Where is Steve Jobs when you need him. It is all bots and no help.

I don't know the answer to your question but I can confirm that my App is the same.

That was a great help Randy, thanks very much. Francis

Update- I managed to get a lab appointment with WWDC. Thanks very much to the Apple people who helped me. It took a large part of the 30 minute appointment but they found a solution. Further to the code that I posted above the List was enclosed in a Section (you can see where I commented // End Section above). Removing the Section made everything work. I still don't know why it worked on macOS but at the moment I am just happy that it is working on iOS as well. Thanks for taking the time to look, those of you that did, and maybe I could be a pointer for others who keep searching like I had been.

I have the same issue - did anyone get an answer to it?