@d1ggs I faced the same issue and the solution I provide here seems to solve it.
Concretely, you can try to modify tf-serving image on the deployment manifest of tf-serving/deployment-resnet50.yaml and tf-serving/deployment-resnet101.yaml by adding a specific version tag (such as 2.8.0). After that you can reapply the deployment e.g.
kubectl apply -f tf-serving/deployment-resnet<version>.yaml
To make sure the deployment is updated, you can also delete the deployment before reapplying it.
kubectl delete deploy image-classifier-resnet<version>
Hope this helps. 
N.B. Other debugging method you could try