Unable to deploy immutable kie-server by using Operator

apiVersion: app.kiegroup.org/v2
kind: KieApp
metadata:
  name: rhdm-production-immutable
  annotations:
    consoleName: rhdm-production-immutable
    consoleTitle: DM Production Immutable
    consoleDesc: Deploys a DM Production Immutable environment
spec:
  environment: rhdm-production-immutable
  objects:
    servers:
      - build:
          kieServerContainerDeployment: rhdm-kieserver-hellorules=org.openshift.quickstarts:rhdm-kieserver-hellorules:1.5.0-SNAPSHOT
          gitSource:
            uri: https://github.com/jboss-container-images/rhdm-7-openshift-image.git
            reference: master
            contextDir: quickstarts/hello-rules/hellorules

{
  "level": "error",
  "ts": "2020-05-14T07:02:44.430558521Z",
  "logger": "kieapp.controller",
  "msg": "Issue creating object. ImageStream.image.openshift.io \"rhdm-kieserver-rhel8@sha256\" is invalid: metadata.name: Invalid value: \"rhdm-kieserver-rhel8@sha256\": must match \"[a-z0-9]+(?:[._-][a-z0-9]+)*\"",
  "kind": "ImageStreamTag",
  "name": "rhdm-kieserver-rhel8@sha256:372d0de47fe02ecacca9f2b48f7ae0f7bfa81f0130eba4f3c6bd8d280c5a9fc1",
  "from": "registry.redhat.io/rhdm-7/rhdm-kieserver-rhel8@sha256:372d0de47fe02ecacca9f2b48f7ae0f7bfa81f0130eba4f3c6bd8d280c5a9fc1",
  "namespace": "ope2"
}
{
  "level": "error",
  "ts": "2020-05-14T07:02:44.430576416Z",
  "logger": "kieapp.controller",
  "msg": "ImageStream.image.openshift.io \"rhdm-kieserver-rhel8@sha256\" is invalid: metadata.name: Invalid value: \"rhdm-kieserver-rhel8@sha256\": must match \"[a-z0-9]+(?:[._-][a-z0-9]+)*\""
}
{
  "level": "error",
  "ts": 1589439764.4427147,
  "logger": "controller-runtime.controller",
  "msg": "Reconciler error",
  "controller": "kieapp-controller",
  "request": "ope2/rhdm-production-immutable",
  "error": "BuildConfig.build.openshift.io \"rhdm-production-immutable-kieserver\" is invalid: spec.strategy.sourceStrategy.from.name: Invalid value: \"rhdm-kieserver-rhel8@sha256\": invalid name syntax",
  "stacktrace": "github.com/go-logr/zapr.(*zapLogger).Error\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/github.com/go-logr/zapr/zapr.go:128\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:218\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:192\nsigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/sigs.k8s.io/controller-runtime/pkg/internal/controller/controller.go:171\nk8s.io/apimachinery/pkg/util/wait.JitterUntil.func1\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:152\nk8s.io/apimachinery/pkg/util/wait.JitterUntil\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:153\nk8s.io/apimachinery/pkg/util/wait.Until\n\t/root/go/src/github.com/kiegroup/kie-cloud-operator/vendor/k8s.io/apimachinery/pkg/util/wait/wait.go:88"
}