Compiling a .NET Core 3.1 WinForms app shows this:
CSC : warning CS8002: Referenced assembly 'ServiceStack.Text, Version=5.0.0.0, Culture=neutral, PublicKeyToken=null' does not have a strong name.
On .NET Framework, everything is strong-named by default - looks like .NET Core/Std may have been overlooked. 
Definitely not overlooked, it’s an explicit decision to limit strong naming to only .NET Framework libs where it’s effectively only useful for legacy compatibility.
That’s why I was originally going to ditch strong-naming in .NET Core, but it turns out it’s important to still use it if you use AppData to store settings - it ensures the created folders don’t get messy if the app is moved around.
ServiceStack being unsigned doesn’t affect my app, so it’s fine, but I wanted to bring it up just in case.