When you execute the undo deployment(oc rollout undo deploy/<name>) won't works. The version doesn't rollback 

    4.13, 4.14, 4.15

    Create an application builded using imagestreams. 

Follow the steps below to reproduce the error: 

mkdir lab 
cd lab 
ls -la
oc new-project lab
oc new-app httpd --name helloworld --binary
echo "hello world" > index.html
oc start-build helloworld --from-dir . --follow
oc expose svc/helloworld
oc get routes
URL=$(oc get route helloworld -o jsonpath='{.spec.host}' )
curl $URL #show hello world 
echo "hello world (undo lab)" > index.html
oc start-build helloworld --from-dir . --follow
curl $URL #show hello world (undo lab) 
oc rollout undo deploy/helloworld
curl $URL # must show hello world      

    The rollout undo is not working 

    The rollout to back the latest version