nw:weak-component-clusters not following seed?

When I run a netlogo code with nw:weak-component-clusters in it, it returns the components in a different random order each time, even when random-seed is specified. I've tried with netlogo 5.1.0, 6.1.0 and 6.2.2 and two different machines, but the problem persists.

extensions [nw]

to setup
  clear-all
  random-seed 5
  create-turtles 1000
  ask turtles [create-link-with one-of other turtles]
  print (nw:weak-component-clusters)
end

, for example will sometimes print '[(agentset, 2 turtles) (agentset, 15 turtles) (agentset, 59 turtles) (agentset, 4 turtles) (agentset, 920 turtles)]', sometimes '[(agentset, 2 turtles) (agentset, 920 turtles) (agentset, 15 turtles) (agentset, 59 turtles) (agentset, 4 turtles)]', sometimes '[(agentset, 15 turtles) (agentset, 59 turtles) (agentset, 920 turtles) (agentset, 4 turtles) (agentset, 2 turtles)]' etc. Any idea what could be causing this?

Run the provided NetLogo example with nw:weak-component-clusters repeatedly using random-seed 5, then inspect the implementation of that primitive in the NW extension. Done means the component list has stable ordering across repeated runs with the same seed, with tests or updated behavior confirming the result.