JBoss ignores "Class-Path" attribute in WAR's MANIFEST.MF

An EAR file that deploys well in JBoss4.0.5 fails to deploy in JBoss5.0Beta1 when initializing the web application (NoClassDefFound).
However, this ear does deploy well when taking the required jar files (the WAR dependencies) out of the EAR and placing them inside the .war/WEB-INF/lib folder, as well as removing the "Class-Path" entry in the WAR's MANIFEST.MF.

Documents stating, as far as I understand, the existence of the requirement that this should work are here:
http://java.sun.com/j2ee/verified/packaging.html
... as well as in the spec ... (http://jcp.org/en/jsr/detail?id=244) in section EE.8.2.1 (Bundled Libraries) starting in page 155.

It's related to Tomcat's classpath (or to the classpath augmentation JBoss performs, where there were probably recent changes to support resource injection into web clients, like servlets). This is why I indicated Tomcat as an additional affected component.