I ran some tests and oddly enough in my case the issue is only occurring on my iPad, not my iPhone. Anyone else?

I have the same problem. Works fine on macOS but crashes on iOS. Have you filed a radar?

For those who'd like to dupe this and for Apple folks: FB9137313

Also, I've noticed that the callback returns a different internal port than the initial one. Somehow internalPort is always set to 3095 in my case. I guess it's radar time.