The org.wildfly.security.jakarta.client.resteasy is not a dependency of the org.jboss.resteasy.resteasy-client nor added to a deployment. Therefore a RESTEasy client in the server never uses the implementation of the API's needed for the wildfly-config.xml to work.

What should likely happen is the module dependency should be an optional module on the org.jboss.resteasy.resteasy-client module. There should be a test added to ensure this works.