Sometimes bucket with set sasl password is created without password

I found a strange behavior of Couchbase Server 1.8.1:
I create bucket on server by sending http -request (using curl) with parameters like that
name=MyBucket&ramQuotaMB=200&authType=sasl&replicaNumber=1&saslPassword=password&
After that Couchbase server creates bucket, but at first few seconds it doesn't contain password (I saw it from web interface).
And after some time password is set, but sometimes it is never set.

I found, that password isn't set when I make another request to Server (get status for example) in time befor password is set by server.