cerebro securityContext - empty object not working

[AbbasHallal]

I am installing cerebro on openshift and I want to set securityContext to null and bind the deployment to default service account, serviceAccountName: default so that I can get random number from the allowed range. However this is not working as expected as it's still setting the default values originally defined see
values.yaml:

securityContext: {}

Deployment:

spec:
  securityContext:
    runAsNonRoot: true
    runAsGroup: 1000
    runAsUser: 1000