The newly released 3.4.7 seems to have a new connection error:
Could not initialize Couchbase cluster and/or [BUCKET_NAME] bucket: Bucket with name [BUCKET_NAME] does not exist or cannot be reached. Couchbase.Management.Buckets.BucketNotFoundException: Bucket with name [BUCKET_NAME] does not exist or cannot be reached.
at Couchbase.Core.ClusterContext.GetOrCreateBucketLockedAsync(String name)*