Kafka topics cannot be renamed, but KafkaTopic's spec.topicName has changed

Issue

• We have initially created a Kafka topic using the following CR:

kind: KafkaTopic  
metadata:
   name: mytopic-20-21 
spec:
   topicName: mytopic_20-21

Later on, we had to rename the topicName. As it's not possible to update the name of a Topic in Kafka, we have deleted it first and then created it again with the new CRD (we have removed one underscore character from the topicName):

kind: KafkaTopic  
metadata:
   name: mytopic-20-21 
spec:
   topicName: mytopic-20-21

As a result, the following Exception is raised: java.lang.IllegalArgumentException: Kafka topics cannot be renamed, but KafkaTopic's spec.topicName has changed.