Incorrect dates convertion

[AShkurpelo]

I converted dates for +- 5 years interval from now to be sure it matches Hijri dates given by MS Umm al-Qura calendar and found 1 mismatch:
moment('2024-12-02').format('YYYY-M-D [is] iYYYY-iM-iD') // 2024-12-2 is 1446-5-30
But according to http://www.ummulqura.org.sa and other resources, it should be 1446-6-1