Chunks in the snowy plains biome and the frozen oceans biome load in wrong chunks overlaying already loaded chunks.

I was in a realm flying my elytra towards spawn when I came across the terrain generation start bugging causing chunks to fill in with different chunks, It ruined a large section of the biome. Things like ice glaciers getting swapped with stone and shipwrecks and structures from underwater spawning on top of the frozen oceans, as well as snowy plains biomes loading in ice chunks causing weird looking terrain. Below if you look at the map in the player’s hand you can see the changes between previous generation (before 1.21.100) and after updating to 1.21.100 (the nether image shows before the bug)