Javascript header not called before rendering a newly modified page

When a portlet injects javascript through doHeader and is newly added to a page, the javascript is not loaded.

Steps to reproduce
1) Deploy the attacked portlet (a built war is avalable)
2) add the portlet in app registry
3) put it on a page -> "Toto is not available" alert message --> KO
4) refresh the page -> "Hello World" alert message. --> OK

This is a critical for PortletBridge or any newly added portlet using RichFaces would fail