Open Bucket fails with localhost ipv6 couchbase

Java SDK
1

I passed cluster address as “[::1]” for a 6.0.2 enterprise couchbase cluster.
Getting couchbase version, creating bucket, deleting bucket, getting Users passed.
Open bucket callcommands.zip (3.1 KB) failed with below error

Caused by: com.couchbase.client.core.CouchbaseException: Could not parse configuration
  at com.couchbase.client.core.config.parser.BucketConfigParser.parse(BucketConfigParser.java:55)
  at com.couchbase.client.core.config.loader.AbstractLoader$1.call(AbstractLoader.java:204)
  at com.couchbase.client.core.config.loader.AbstractLoader$1.call(AbstractLoader.java:200)
  at rx.internal.operators.OnSubscribeMap$MapSubscriber.onNext(OnSubscribeMap.java:69)
  ... 24 more
Caused by: com.couchbase.client.deps.com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.couchbase.client.core.config.DefaultNodeInfo`, problem: Could not analyze hostname from config.
 at [Source: (String)"{"rev":49,"name":"ipv6test","uri":"/pools/default/buckets/ipv6test?bucket_uuid=110a484bde8358b25185dde19f88b33c","streamingUri":"/pools/default/bucketsStreaming/ipv6test?bucket_uuid=110a484bde8358b25185dde19f88b33c","nodes":[{"couchApiBase":"http://::1:8092/ipv6test%2B110a484bde8358b25185dde19f88b33c","hostname":"::1:8091","ports":{"proxy":11211,"direct":11210}}],"nodesExt":[{"services":{"mgmt":8091,"mgmtSSL":18091,"cbas":8095,"cbasCc":9111,"cbasAdmin":9110,"cbasSSL":18095,"eventingAdminPort":80"[truncated 4794 chars]; line: 1, column: 859] (through reference chain: com.couchbase.client.core.config.DefaultCouchbaseBucketConfig["nodes"]->java.util.ArrayList[0])
  at com.couchbase.client.deps.com.fasterxml.jackson.databind.exc.InvalidDefinitionException.from(InvalidDefinitionException.java:67)
  at com.couchbase.client.deps.com.fasterxml.jackson.databind.DeserializationContext.instantiationException(DeserializationContext.java:1608)
  at com.couchbase.client.deps.com.fasterxml.jackson.databind.deser.std.StdValueInstantiator.wrapAsJsonMappingException(StdValueInstantiator.java:484)

Is ipv6 address passed correctly? Why did this fail, when everything else worked with same CouchbaseCluster ?
java-client version 2.7.2