When user decides to configure custom TLS certificate for both the TLS and external listeners, they will be both mounted into the same path and the pod creation will fail:

create Pod my-cluster-kafka-0 in StatefulSet my-cluster-kafka failed error: Pod "my-cluster-kafka-0" is invalid: spec.containers[0].volumeMounts[7].mountPath: Invalid value: "/opt/kafka/custom-certs": must be unique

They need to use separate directory / paths to mount the files.

Created by Strimzi#2341