Why does the content disappear after creating a servlet?? Is this a bug? It's replicable!

Steps:
1. Use Plugins SDK to create a portlet
2. Use NetBeans 6.7 to open the portlet (File > New Project > Java Web Application with Existing Source; create nbbuild.xml)
2a. Right-click on the project node in the File or Project window, select Properties in the context menu, go to Libraries and add appropriate libraries (JSTL 1.1, Portlet 2.0 JSR 286, Liferay JARs, etc.)
3. Deploy to Liferay (build.xml > deploy)
4. Add the new portlet to Liferay portal using Add Application under the dock, and observe in the browser that the template portlet is deployed, showing the boiler-plate content:

Attachments:

before_adding_servlet.PNG (105.5k)

Steps Cont'd:
5. Create new servlet (right-click in appropriate file node and select New > Servlet in context menu; follow the steps, making sure to check Add information to deployment descriptor).
6. Observe modified web.xml (correct the web-app xmlns attributes for Tomcat 5.5.x):

Attachments:

adding_servlet.PNG (94.8k)

Steps Cont'd:
7. Deploy portlet (build.xml > deploy)
8. Refresh browser:

Attachments:

after_adding_servlet.PNG (106.6k)

Discovered this to be caused by having a servlet name (<servlet-name> in web.xml) that matches the portlet name (<portlet-name> in portlet.xml).

Is this a feature or a bug? If bug, is it Liferay's? And why does it not get logged?