A long line of chunks did not generate smoothly in my world on the new snapshot. The world was generated two snapshots ago, but this area of the world was not visited until 21w43a.

Over approximately 1,700 blocks, a sheer delineation between chunks exists where they do not smoothly transition to the next biome. It is not a straight line; it occasionally shifts to the right or left by one to three or four chunks. 

Seed is -8728136955045944167; coordinates are 143, -704 to 517, 971. The rest of the world generated normally, so I'm unsure if this is just a quirk of the seed or if it is an actual bug.