Any SEO surprises during the Google Dec 2025 algorithm update?

Have your sites noticed any change during the recent Google December 2025 algorithm update?

Comparing Nov 1-15 vs Dec 1-15, I found (IT domain):

=> Impressions have nearly doubled
=> Clicks are flat or have a minor dip
=> Positions have gone down

Any findings/suggestions?

In this update, Google has significantly expanded the reach of Topical Authority.