Durable op timing out after a lot of collections activity

In my gocb tests I am seeing the first (always only the first) of my enhanced durability tests reliably fail due to operaton timeout when running against server 7.0.0-3016 when my collections tests are also enabled. The second test also seems to run quite long, although does pass, tests after that are OK. These durability tests all pass reliably against 6.5 and 6.6.

The collections tests run before durability tests and do quite a lot of creating/removing of collections and scopes, when the collections tests are disabled the first durability test passes fine. I can also get the first durability test to pass when collections tests are enabled by using a 15s sleep before the durability test.

I've attached a cbcollect from both nodes.

An example Jenkins gocb test output is: http://sdk.jenkins.couchbase.com/job/golang/job/gocb/job/gocb-manual-test/64/consoleFull

The cluster is available at: http://172.23.111.134:8091/ui/index.html (I can provide credentials to access via ssh)