This is a known bug in 2.2.1CR1 which I believe is fixed in the nightly builds. That's just a release candidate, not necessarily ready for production deployment yet.
really weird -
I have just had to build a new workspace, as my previous one went into a jBOSS AS deploy loop (another problem when you edit pages.xml in jboss tools - which generates xxx.spdia file - which seems to kill the AS
by the way i tried jboss as6 but seemed to get loads of other probelems and gave up - back to 5.1 and seam 2.1.0 again )
however having built my new workspace with 5.1 plus seam 2.1.0GA - i am getting these unexpanded attributes in the log output - whereas on the previous workspace i didnt
this is very frustrating - why would it stop when i rebuild from 2.2.1 back to 2.1.0?
i cant read the output now and will have to recode to do it as a string concat the hard way.
is there a config line in the eclipse config in jboss tools messing this up - on just something in seam libraries somewhere -