HTML code visible when inserting velocity macro displaying a property

Follow this steps to reproduce:

• Edit a new page with the class editor
• Add a TextArea property and save (I named my property "testproperty")
• Edit the same page with the object editor
• Add an object of the class we have just defined
• Set the TextArea property to a non empty string (I used "foobar")
• Edit the same page in WYSIWYG mode
• Insert a velocity macro that displays the property of the object we just added:

  $doc.display("testproperty")
  

The displayed text is:

<p>foobar</p>

As you can see the HTML code is visible.