Scope ["ScopeName"] already exists exception trying to create a collection

CB Server: Enterprise Edition 7.0.0 build 5127

JAVA SDK: 3.1.5

TXNJ: 1.1.8-SNAPSHOT

Steps to reproduce:

1. Create any bucket and then create a custom scope say "customScope"
2. Create a collection  say "customCollection"
3. Run a transaction for "createStagedInsertOnPendingTransaction"
4. Now drop the above collection i.e "customCollection" 
5. Immediately recreate the collection  with same name "customCollection"
6. We are getting the error :Scope [customScope] already exists.

Jenkins Job:

http://sdk.jenkins.couchbase.com/blue/organizations/jenkins/jvm%2Ftransactions%2FTransactionsFITPerformer_SinglePerformer/detail/TransactionsFITPerformer_SinglePerformer/485/tests/

TestName:

7.0-stable Vs Java_1.1.8-SNAPSHOT :  replace_atopStagedInsert_whenCollectionHasBeenDeleted_shouldSucceed – com.couchbase.transactions.ATRDeletedTest

Note: This issue happens very rarely.

1. Checked without transactions and it was never replicated. Ran the junit test multiple times with RepeatedTest(100).

2. Its occurring very rare even with the failed transaction.Reproduced only once on local with multiple runs of RepeatedTest(100).but you can see the failure in above jenkins job.