BUG JSP editor jsp:attribute action

Hello, there's a bug in JDeveloper.
1. Create tag file
<%@ tag pageEncoding="UTF-8"%>
<%@ attribute name="x" fragment="true" required="true" %>
2. Create JSP file
<%@ page contentType="text/html;charset=UTF-8"%>
<%@ taglib tagdir="/WEB-INF/tags/" prefix="tags"%>
<tags:tagFile1>
<jsp:attribute name="x">
Hello
</jsp:attribute>
</tags:tagFile1>
JDeveloper underlines the tag in red and says "Required attribute x is missing..." OC4J runtime behaviour is normal (if we ignore other issues with tag files). I am using JDeveloper 10.1.3.1.

Hi,
Put this code in the editor and see it will show you the preview
=========================================
<%@ taglib uri="tagLib" prefix="hbj" %>
<html>
<body>
Hello
</body>
</html>
============================================
This will not show you a preview
===========================================
<%@ taglib uri="tagLib" prefix="hbj" %>
<jsp:useBean id="myBean" scope="application" class="com.cts.bean.User" />
<hbj:content
     id="myContext">
<hbj:page title="Kirupanand">
   <hbj:form id="myFormId" >
<hbj:inputField type="String" id="Getuser"
    size="30" value="" maxlength="8"
    disabled="false">
   </hbj:inputField>
<hbj:inputField type="String"
id="Displayuser" size="30"
value="<%=myBean.getUser()%>"
maxlength="8"      disabled="false">
</hbj:inputField>
<hbj:button id="Store" text="Save" width="125px"
tooltip="Save User Name" onClick="clientSave"
disabled="false" design="STANDARD" />
</hbj:form>
</hbj:page>
</hbj:content>
<html>
<body>
Hello
</body>
</html>
===================================================
what does this mean? If you use HTMLB tags then you cannot see a preview. Not because of " <%@ taglib uri="tagLib" prefix="hbj" %> " this statement is used to tell to the program which executes the jsp that use this TagLib to understand what the component starting with hbj should do.

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BUG JSP editor jsp:attribute action

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