ObjectField is Marked as depreciated until additional parameters are added. Two version of this method exist however the one that not depreciated is not suggested for code edits. 

Create new C# script: ObjectFieldTesting and add the below code

using UnityEditor;
using System;

public class ObjectFieldTesting : Editor
{
    public override void OnInspectorGUI()
    {
        Object currentValue = new Object();
        Type type = typeof(int);

        base.OnInspectorGUI();
        EditorGUILayout.ObjectField();
        EditorGUILayout.ObjectField((UnityEngine.Object) currentValue, type, true);
    }
}

Then move your mouse cursor over the incomplete EditorGUILayout.ObjectField(); method and note the tooltip- [depreciated]UnityEngine....

Expected result: ObjectField is recognized as the non-depreciated version of the method and parameters are suggested 

Actual Result: The depreciated version is instead shown and no guidance on creating an ObjectField is given

!devenv_wt9LjG0fo8.gif!