camel hystrix not calling Fallback - FIS 2.0 with OCP 3.5

Issue

Pls ref CAMEL-10430
If I change the hystrix component to 2.18.4, it works, but does not work with redhat version 2.18.1.redhat-000015

<fabric8.version>2.2.170.redhat-000013</fabric8.version>

            <camel:hystrix>
                <camel:hystrixConfiguration id="digital-glue-hystrix"
                                            executionIsolationStrategy="SEMAPHORE"
                                            executionTimeoutInMilliseconds="5000"/>
                <camel:to id="digital-glue-client" uri="cxfrs:bean:digitalGlueRSClient?synchronous=true&amp;httpClientAPI=false"/>
                <camel:log message="DG response - ${body}" loggingLevel="INFO"
                           logName="com.redhat.test"/>

                <camel:onFallback>
                    <camel:throwException exceptionType="java.lang.Exception" message="Unable to get response from the digital glue"/>
                </camel:onFallback>
            </camel:hystrix>