Temporarily incorrect data bucket item count after failed 'add server node'

I attempted to add a new server node to an existing 1-node Couchbase cluster, but it failed because the other node didn't have enough RAM. After displaying the error message, the item counts on all of the buckets were 0, even though the status was green. This made it appear (to me, a fairly new Couchbase user) as though all of the data had been lost. Within about 30 seconds, the correct node counts were being displayed again in the UI, and no data was lost.