I'm not 100% sure about that, but AFAIK this worked correctly in previous Wildfly versions (11 or 12?).

CDI 1.2 didn't have this functionality for sure. Therefore, if this worked, it could have been incidental or you might have been using the EE 8 mode on WFLY 12 where Weld 3 was already present?

Furthermore, in your code, those two observers have different @WithAnnotations. So I presume you have been observing this issue with PAT events which contained all the annotations required by both observers, am I correct?