Etag header values (a hash in this case) from API requests are NULL after upgrading to Xamarin.iOS 18.104.22.168. They are present in Xamarin.iOS 12.4.x.x, Android, any HTTP client tool, Swagger (basically the response from any other requests).
All other header values appear intact. Anyone having a similar issue. I'm trying to narrow it down, and am stuck on 12.4.x.x for now.
fyi - 12.8 appears to be the default for VS 2019 for Mac, which has it's own issue with Android, so we're sticking w/VS2017 for now, as well.