JGroups 4.1.0.Final has several improvements for running under Quarkus, plus should be better at using the same kind of IP address everywhere when not running with -Djava.net.preferIPv4Stack=true:

http://belaban.blogspot.com/2019/05/410-released.html

4.1.1.Final adds a fix for JGRP-2350 (TCP: connection close can block when send() block on full TCP send-window) and for JGRP-2354 (ForkChannel does not receive SITE_UNREACHABLE events)