If you are looking for specific technical documentation or the full "reason" (Powód) cited in the edit you mentioned, it likely refers to a or balance adjustment applied during a hotfix following the 1.1 launch. Victoria 3 - Dev Diary #68 - Patch 1.1 Changelog (part 4)
Based on the date and details provided, the feature you are likely referring to is the update for Victoria 3 , which was released shortly before that date (December 5, 2022). Victoria 3Data edycji: 15-12-2022, 15:11PowГіd: ...
: Added several "quality of life" features, such as a new population interface and a more detailed breakdown of market prices and trade routes. If you are looking for specific technical documentation