Hello there!
We are utilizing the Mindscape.Raygun4Net.AspNetCore package and have discovered that ExcludeErrorsFromLocal on RaygunSettings is only being referenced by RaygunAspNetMiddleware:
https://github.com/MindscapeHQ/raygun4net/blob/c464d6da64e54996d8644f5ba920d9aec1158ec2/Mindscape.Raygun4Net.AspNetCore/RaygunAspNetMiddleware.cs#L81
There is no check against this setting in RaygunClient.cs, so any direct calls to Send() or SendInBackground() will send the exception even from local origins.
It appears this setting was working correctly in Mindscape.Raygun4Net.