JSF pages containing #{session.id} fail with NotSerializableException when sessions are distributable

[pferraro]

Describe the bug

JSF pages containing #{session.id} fail with:
java.io.NotSerializableException: com.sun.faces.cdi.SessionProducer$$Lambda$1586/0x0000000100cc6478
... when deployed as a web application.

SessionProducer creates a SessionScoped bean using a non-serializable function, which naturally fails to serialize.
I see nothing about this bean that should warrant it being SessionScoped rather than RequestScoped.

To Reproduce

A reproducer for this issue is available at: https://issues.redhat.com/browse/WFLY-17840

Expected behavior

#{session.foo} should behave the same as #{request.session.foo}.

Additional context

Changing #{session.foo} expressions to #{request.session.foo} sufficiently works around the issue. This resolves the expression via the RequestProducer, which, of course, is RequestScoped.