Steps to reproduce

git clone https://github.com/nil4/MvcCoreObjectResultRepro.git
cd MvcCoreObjectResultRepro
dotnet restore
dotnet run

Open http://localhost:5000/ in your browser.

Expected results

The page displays {"a":"test"}, i.e. only the ObjectResult value is returned to the client.

Actual results

The page displays {"value":{"a":"test"},"formatters":[],"contentTypes":[],"declaredType":null,"statusCode":null} instead, i.e. all the properties of ObjectResult are returned to the client, not just the value.