Yes, composite component validation had a lot of bugs in JBoss Tools (JBT) 3.2. I believe we fixed most of them in JBT 3.3 but some may remain. BTW Eclipse WTP also validates composite components and you still can see some wrong problem markers even using Eclipse 3.7 + WTP 3.3 + JBT 3.3.
Could you create an issue in https://issues.jboss.org/browse/JBIDE and provide steps to reproduce all the issues you found. We will verify them against JBoss Tools 3.3.0.M3.
Thanks.