1.21.50 World Spawn Location Algorithm change is mentioned in the changelog but not implemented in-game.

In the changelog for 1.21.50 it is mentioned that the world spawn algorithm has been changed, but it has not. In Preview version 1.21.50.29 this change is implemented. Below I have attached screenshots for the world spawn location for Seed: 542491775383969368 for both 1.21.50 and 1.21.50.29 along with a screenshot of the changelog that mentions this change.