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From forums:https://forums.couchbase.com/t/hot-upgrading-couchbase-servers-failed-request-using-couchbase-net-client-3-1-1/29122
This seems to fixed on master. Will re-open if the reporter can still reproduce on 3.1.2.
From forums:https://forums.couchbase.com/t/hot-upgrading-couchbase-servers-failed-request-using-couchbase-net-client-3-1-1/29122