dsym and Xamarin.iOS

I've seen this blog post from the Raygun team regarding native reporting and dsyms with Xamarin.iOS: https://raygun.com/blog/raygun-for-xamarin-ios-supports-unified-api-and-native-error-reporting/

It is a bit outdated as that API for attaching no longer exists, but we are currently reporting native errors. However our sample errors looks something like this:

System.Linq.Enumerable.Single[TSource](System.Collections.Generic.IEnumerable1[T] source, System.Func2[T,TResult] predicate) in

So there are no line numbers or any good information here other than the class namespaces. If I generate a dsym file and upload it to Raygun, I'm not getting any more information. Shouldn't Raygun report the line number where that linq exception occurs? Am I supposed to upload dsyms for Xamarin.iOS apps and how much, if at all, would it deobfuscate the stack traces? Currently I generate the dsyms by adding the --dsym=true argument for my release build, build the app, zip up the dsym, upload it to Raygun, then generate a test error as above. I saw the following link under the Apple section that talks about why some more stack trace detail might not be available but is this relevant to Xamarin.iOS apps? https://raygun.com/documentation/language-guides/apple/crash-reporting/advanced-setup/#why-are-my-stack-traces-not-symbolicated