Date of package publish vs package changelog

I am using Ubuntu Mate 20.04.3 LTS.

Today I have upgraded kernel from to (linux-image-5.4.0-92-generic).
But in changelog date is 26 Nov 2021:

apt changelog linux-image-5.4.0-92-generic

linux-signed (5.4.0-92.103) focal; urgency=medium

  • Master version: 5.4.0-92.103

-- Kleber Sacilotto de Souza [email protected] Fri, 26 Nov 2021 15:45:40 +0100

So why upgrade (with apt)was available only from today(5 Jan 2022) not earlier.
Is it something wrong with ubuntu mirror or my system? I am using mirror.