Write CSV Attachment from JSON array does not work when more than one message is processed per component lifecycle

[jhorbulyk]

Steps to Reproduce

Create a flow of the following form. Note that executing samples for each step will function as expected.

• Code component:

  async function run(msg, cfg, snapshot) {
  for(let i = 0; i < 2; i++) {
    const arr = [];
    for(let  j = 0; j < 5; j++) {
      arr.push({
        hello: 'world',
        i,
        j        
      });
    }
    await this.emit('data', messages.newMessageWithBody({
      results: arr
    }));
  }
  }

• CSV.Write CSV Attachment from JSON array
  • Include Headers: yes,
  • Separators: ,
  • inputArray: (JSONata mode) results
• Utility Component.Attachment to String
  • Attachment Id or URL: (JSONata mode) url
• Email component:
  • TO:
  • Subject: CSV Bug
  • Body: (JSONata mode) result

Publish the flow and run the flow

Expected Result

Two emails arrive with the following contents

hello,i,j
world,0,0
world,0,1
world,0,2
world,0,3
world,0,4

and

hello,i,j
world,1,0
world,2,1
world,3,2
world,4,3
world,5,4

Actual Result

Two blank emails arrive