API gives incorrect/delayed results

[plainlystated]

I'm getting an error when querying properties of recently created lists: After I create a list, I then query for the list of lists (CreateSend::Client#lists) and the recently-created list is missing most of the time.

This rake task consistently exhibits the issue for me:

require 'createsend'

namespace :campaign_monitor do
  task :demo do
    auth = {api_key: API_KEY}
    client_id = CreateSend::CreateSend.new(auth).clients.tap do |cs|
      raise if cs.size != 1
    end.first['ClientID']

    client = CreateSend::Client.new(auth, client_id)

    p [:available_lists, client.lists.map(&:Name)]
    # (empty list to start)

    20.times do |i|
      puts "Creating list#{i}"
      list_id = CreateSend::List.create(auth, client_id, "list#{i}", "https://localhost", false, "https://localhost")

      sleep 10 

      p [:available_lists, client.lists.map(&:Name)]
      # Even after 10 seconds, still missing....

      puts
    end
  end
end

Output:

[:available_lists, []]
Creating list0
[:available_lists, []]

Creating list1
[:available_lists, []]

Creating list2
[:available_lists, ["list0", "list1", "list2"]]

Creating list3
[:available_lists, ["list0", "list1", "list2"]]

Creating list4
[:available_lists, ["list0", "list1", "list2"]]

Creating list5
[:available_lists, ["list0", "list1", "list2", "list3", "list4", "list5"]]

Creating list6
[:available_lists, ["list0", "list1", "list2", "list3", "list4", "list5"]]

Creating list7
[:available_lists, ["list0", "list1", "list2", "list3", "list4", "list5"]]

.... (etc, same 30-second delay for the rest) ...

I can, however, grab the list ID that comes back from the CreateSend::List.create call, and use it to delete the list from the server (presumably I could do other things with it via the API).

This behavior definitely feels unintuitive, so some docs about what my expectations should be would be nice at least.