chia7712 commented on code in PR #19635:
URL: https://github.com/apache/kafka/pull/19635#discussion_r2080768388


##########
core/src/main/scala/kafka/server/KafkaApis.scala:
##########
@@ -411,10 +411,9 @@ class KafkaApis(val requestChannel: RequestChannel,
         }
 
         val topicPartition = new TopicPartition(topicName, partition.index())
-        if (topicName.isEmpty)
+        // To compatible with the old version, only return UNKNOWN_TOPIC_ID if 
topicId is not default value
+        if (topicName.isEmpty && !topic.topicId().equals(Uuid.ZERO_UUID))

Review Comment:
   That makes sense. I left the similar comment before - 
https://github.com/apache/kafka/pull/19635#discussion_r2073937574



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