docx: Numbering start from number doesn't work

My greetings 😃 This list men to to start from 50, but it does not. Do I do something wrong or feature got corrupted? Tested on 6.0.1, 6.0.3 Based on: https://github.com/dolanmiu/docx/blob/7acd9e1/src/file/numbering/level.ts#L89

const fs = require('fs');
const { Document, Packer, Paragraph, PageNumberFormat} = require('docx');

const doc = new Document({
  numbering:{
    config:[{
      reference: 'ref1',
      levels: [
        {
          level: 0,
          format: PageNumberFormat.DECIMAL,
          text: '%1)',
          start: 50,
        }
      ],
    }]
  },
  sections: [{
    children: [
      new Paragraph({
        text: "REF1 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 0,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF1 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 0,
          level: 0,
        }
      }),
      new Paragraph({
        text: "REF1 - inst:0 - lvl:0",
        numbering : {
          reference: 'ref1',
          instance: 0,
          level: 0,
        }
      }),
    ],
  }]
});

// Used to export the file into a .docx file
Packer.toBuffer(doc).then((buffer) => {
    fs.writeFileSync("start_numbering.docx", buffer);
});