Multiple reroll directives are not handled correctly?

[propri]

> const { DiceRoller } = require('dice-roller-parser')
undefined
> roller = new DiceRoller()
{ randFunction: [Function: random], maxRollCount: 1000 }
> roller.roll('1d4r1r4')
{
  count: { type: 'number', value: 1, success: false, valid: true, order: 0 },
  die: { type: 'number', value: 4, success: false, valid: true, order: 0 },
  rolls: [
    {
      critical: 'success',
      die: 4,
      matched: false,
      order: 0,
      roll: 4,
      success: false,
      type: 'roll',
      valid: false,
      value: 4
    },
    {
      critical: 'success',
      die: 4,
      matched: false,
      order: 1,
      roll: 4,
      success: false,
      type: 'roll',
      valid: false,
      value: 4
    },
    {
      critical: 'failure',
      die: 4,
      matched: false,
      order: 2,
      roll: 1,
      success: false,
      type: 'roll',
      valid: true,
      value: 1
    }
  ],
  success: false,
  type: 'die',
  valid: true,
  value: 1,
  order: 0,
  matched: false
}

With multiple rerolls in the formula, only the last one seems to be respected.

See the example, 1d4r1r4 -> 4 is rerolled, but 1 is used as last value.

The same forumla works on roll20: