检视面板中多态类型显示空白问题求助

开发中遇到Unity检视面板（Inspector）里多态类型显示空白的问题，涉事代码量较大已上传至GitHub。具体现象：

• 展开NamePart字段时，主字段名称变更，下拉框与字段间、字段后出现空行，但NamePart的子字段完全不显示；
• FamilyNames字段显示正常。

已检查属性抽屉（Property Drawer）配置及字段序列化，未发现明显问题，但仍无法定位成因和修复方案。以下是相关代码片段：

名称生成器属性抽屉代码 #

protected override void DrawProperty ( Rect position, SerializedProperty property, GUIContent label, bool isPolymorphic )
{
    EditorGUI.BeginProperty ( position, label, property );
    Rect pos = new ( position.x, position.y, position.width, EditorGUI.GetPropertyHeight ( property.FindPropertyRelative ( "m_Feminine" ) ) );
    EditorGUI.PropertyField ( pos, property.FindPropertyRelative ( "m_Feminine" ));

    pos.y += pos.height + EditorGUIUtility.standardVerticalSpacing;
    pos.height = EditorGUI.GetPropertyHeight ( property.FindPropertyRelative ( "m_Masculine" ) );
    EditorGUI.PropertyField ( pos, property.FindPropertyRelative ( "m_Masculine" ));

    pos.y += pos.height + EditorGUIUtility.standardVerticalSpacing;
    pos.height = EditorGUI.GetPropertyHeight ( property.FindPropertyRelative ( "m_Neutral" ) );
    EditorGUI.PropertyField ( pos, property.FindPropertyRelative ( "m_Neutral" ));

    pos.y += pos.height + EditorGUIUtility.standardVerticalSpacing;
    pos.height = EditorGUI.GetPropertyHeight ( property.FindPropertyRelative ( "m_FamilyNames" ) );
    EditorGUI.PropertyField ( pos, property.FindPropertyRelative ( "m_FamilyNames" ) );
    EditorGUI.EndProperty ();
}

多态属性抽屉代码 #

public sealed override void OnGUI ( Rect position, SerializedProperty property, GUIContent label )
{
    // ... 
    if (reference != null && propertyHeight > 0)
    {
        property.isExpanded = EditorGUI.Foldout ( labelRect, property.isExpanded, property.displayName, true );
    }
    else
    {
        EditorGUI.LabelField ( labelRect, label );
    }
}

内容的提问来源于stack exchange，提问作者RWolfe