humanize a duration returns month instead of days with updated locale

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Describe the bug

When updating the locale to change the 'a month' format to '1 month':

dayjs.updateLocale('en', {
  relativeTime: {
    future: 'in %s', past: '%s ago', s: '%d seconds',
    m: '%d minute', mm: '%d minutes',
    h: '%d hour', hh: '%d hours',
    d: '%d day', dd: '%d days',
    M: '%d month', MM: '%d months',
    y: '%d year', yy: '%d years'
  }
});

The humanize function does not work as expected.

dayjs.duration(1, "month").humanize() returns '30 month'
same for dayjs.duration(30, "days").humanize() and dayjs.duration("P1M").humanize()

I have tested the limits:

dayjs.duration(25, 'days').humanize()
'25 days'
dayjs.duration(26, 'days').humanize()
'26 month'
dayjs.duration(45, 'days').humanize()
'45 month'
dayjs.duration(46, 'days').humanize()
'1 month'

Expected behavior
It should return '1 month'

Information

• Day.js Version 1.11.12
• OS: windows
• Browser Chrome 126
• Time zone: CET