Understanding `.register()` Behavior on Frequency Metrics in TypeScript

export const testMetric = Metric.counter("test", { incremental: true }).register()
export const testMetric2 = Metric.frequency("test2").register() // alternatives with a predetermined value don't work either

{
  descriptor: {
    name: 'test',
    description: '',
    unit: '1',
    type: 'COUNTER',
    valueType: 1
  },
  dataPointType: 3,
  dataPoints: [
    {
      startTime: [ 1710946840, 929000000 ],
      endTime: [ 1710946900, 925000000 ],
      attributes: {},
      value: 0
    }
  ]
}
{
  descriptor: {
    name: 'test2',
    description: '',
    unit: '1',
    type: 'COUNTER',
    valueType: 1
  },
  dataPointType: 3,
  dataPoints: []
}