Wildfly 13 that contains libs for both cdi 1.2 and 2.0 are wrongly identifying cdi version (probably) and shows message that is dedicated to 2.0 spec even though that project nature is defined for cdi 1.2.
I can only see a problem in choosing the cdi version in cdi jbt core or ambiguous options of cdi libs in wf 13 server.
UPDATE: Issue appears also when using WildFly 16