Keycloak-operator v16.0.0 fails on launch

I’ve been running keycloak-operator installed/managed keycloak on OSP 4.7 for over a year with turnkey ease… the most recent v16.0.0 update seems to break on startup, with

10:31:06,197 FATAL [] (ServerService Thread Pool – 67) Error during startup: j
ava.lang.NoSuchMethodError: ‘org.jboss.resteasy.core.interception.ContainerRequestFilterRegistry

Any advice on how to configure operator subscription to fall back to 15.1.1?