PortletViewHandler markup exception

Solution Verified - Updated -

Issue

After upgrading to EPP 4.3 CP06 I'm getting this error in some portlets:
17:30:20,187 INFO  [PortletViewHandler] Error rendering view by parent ViewHandler, try to render as portletbridge JSP page
com.sun.facelets.FaceletException: Error Parsing /jsp/myPage.jsp: Error Traced[line: 1] The markup in the document preceding the root element must be well-formed.
at com.sun.facelets.compiler.SAXCompiler.doCompile(SAXCompiler.java:234)

It only comes up if there is an GenericFacesPortlet using jsp instead of xhtml. This worked correctly in EPP4.3 CP04!

Have there been changes in the parser restrictions or maybe a some changes for jsp in the portletbridge?

Environment

JBoss Enterprise Portal Platform 4.3 CP06

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