It seems that we introduced a mistake in CDI 2.0 regarding its alignment with JTA. See https://issues.jboss.org/browse/CDI-705

Transactional observer bound to BEFORE_COMPLETION shouldn’t be triggered if the transaction is rolled back or marked for roll back.

I suggest that we skip the matching test in the TCK [1] and allow impl to skip this rule and align on JTA.

JTA should be corrected in a coming MR.

Thanks for your feedback

[1] https://github.com/cdi-spec/cdi-tck/blob/master/impl/src/main/java/org/jboss/cdi/tck/tests/event/observer/transactional/roolback/TransactionalObserverRollbackTest.java