retrieveSubscription timeout with customer expand

case.js

// this function process a webhook event received from Stripe

function(request, reply) {
    var event = request.payload;
    var charge = event.data.object;

    if (event.type !== 'charge.succeeded') {
      return reply('This hook only processes charge succeeded events');
    }

    // TBH I don't know why we do this, but it's not relevant, if there is a reason.
    stripe.retrieveCharge(
      charge.id,
      function(fetchChargeErr, charge) {
        if (fetchChargeErr) {
          return reply(boom.badImplementation('An error occurred while fetching the invoice for this charge', fetchChargeErr));
        }

        if (!charge.invoice || !charge.invoice.subscription) {
          return reply('Charge not part of a subscription');
        }
        
        // this is where I hit the issue - with the `expand: ["customer"]` option, 
        // the request hangs until the HTTP client library hits the request timeout limit
        // Without the expand, this request has no problem
        stripe.retrieveSubscription(
          charge.invoice.customer,
          charge.invoice.subscription,
          {
            expand: ["customer"]
          },
          function(retrieveSubscriptionErr, subscription) {
            if (retrieveSubscriptionErr) {
              return reply(boom.badImplementation('An error occurred while fetching the subscription for this charge\'s invoice', retrieveSubscriptionErr));
            }
            
            //removed body of function 
          }
        );
      }
    );
  }