{}:8091/pools/default/buckets/{}/stats doesn't provide all information in windows performance runs

Our windows performance runs are failing. Our automation needs information from {}:8091/pools/default/buckets/{}/stats, including curr_items and replica_curr_items. However, the information is missing. In the run below, we have loaded 20M docs, but 8091/pools/default/buckets/{}/stats doesn't provide any information. 

The build we used is 6.6.5-10080, and the issue is reproducible.

Job: http://perf.jenkins.couchbase.com/job/zeus/8273/

Logs:

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-01.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-02.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-03.perf.couchbase.com.zip 

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-04.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-05.perf.couchbase.com.zip

https://s3-us-west-2.amazonaws.com/perf-artifacts/jenkins-zeus-8273/zeus-srv-06.perf.couchbase.com.zip

Note, our runs on CentOS with the same build don't hit the issue. 

Example: