subdoc request does not timeout at default 2500ms

I used Task to check if the subdoc operation time out works and found it hits wrapper's timeout instead of the SDK's timeout as attached.

To explain the attached screen shot, builder.Execute() is supposed to be timed out in 2500 ms. and the builder.Execute() is wrapped with Task to timeout the task in 3 seconds (3000 ms). Ideally, if builder.Execute() timesout in 2500 ms, the Task timeout of 3 seconds should never happen but it actually hits the 3 seconds time out.