IPv4 address within IPv6 in segment form not correctly recognised

[lloydk04]

Parsing of a v4 address within v6 in octet format is correctly recognised as v4

const ipAddress = require('ip-address');
v6Address = new ipAddress.Address6('::ffff:127.0.0.1');
> Address6 {
  groups: 8,
  v4: true,
  subnet: '/128',
  subnetMask: 128,
  zone: '',
  address: '::ffff:127.0.0.1',
  addressMinusSuffix: '::ffff:127.0.0.1',
  elidedGroups: 5,
  elisionBegin: 0,
  elisionEnd: 5,
  valid: true,
  parsedAddress: [ '0', '0', '0', '0', '0', 'ffff', '7f00', '1' ] }
v6Address.v4
> true

but, not when in segment (hex) format. The following should be equivalent to the above address

v6Address = new ipAddress.Address6('::ffff:7f00:0001');
> Address6 {
  groups: 8,
  v4: false,
  subnet: '/128',
  subnetMask: 128,
  zone: '',
  address: '::ffff:7f00:0001',
  addressMinusSuffix: '::ffff:7f00:0001',
  elidedGroups: 5,
  elisionBegin: 0,
  elisionEnd: 5,
  valid: true,
  parsedAddress: [ '0', '0', '0', '0', '0', 'ffff', '7f00', '1' ] }
v6Address.v4
> false

As I understand it (https://en.wikipedia.org/wiki/IPv6_address and elsewhere) both representations are valid (and equivalent).