This seems to be back but this time with Servlet 4.0 only as 3.1 seems to work just fine. Current test is already in Wildfly testsuite but it does not cover Servlet 4.0.
Java EE7 (which supports EL 3.0 spec) allows JSPs to use EL expressions like:
in the above example aren't evaluated correctly and instead a blank string is rendered for them.
More details in the linked forum thread https://developer.jboss.org/thread/271825