Convention-Based Action Routes Do Not Return 400 as Expected

[commonsensesoftware]

Controllers that use convention-based routing do not always return 400 for actions that match in some API versions, but not others.

For example:

[ApiVersion( "1.0" )]
public class MyController : ApiController
{
   public IHttpActionResult Get() => Ok();
}
[ApiVersion( "2.0" )]
public class My2Controller : ApiController
{
   public IHttpActionResult Get() => Ok();
   public IHttpActionResult Patch() => StatusCode( HttpStatusCode.NoContent );
}
[ApiVersion( "3.0" )]
public class My3Controller : ApiController
{
   public IHttpActionResult Get() => Ok();
}

The requested routes should produce the following results:

Request	Expected Result	Actual Result
PATCH /my?api-version=1.0	400	404
PATCH /my?api-version=2.0	204	204
PATCH /my?api-version=3.0	400	404