There is a clear abnormal behaviour of the previous loaded/explored chunks after 1.21.100 update as this update covers major change to frozen ocean biome. The biome before update was all ice but after update it became stone+ice mixed which is very unusual. Not applicable to newer chunks only old loaded chunks and every chunk didnt show the behaviour. Please see the screenshots of before and after the update
Potential steps to reproduce.
1.Go to a frozen ocean biome in the version 1.21.94 or below.
2.Update the game to 1.21.100.
3.Play in the same world and the frozen ocean contain stone surface and bergs as show in screenshot.
The screenshot is not on same cords but pretty close to it like 10-20 blocks apart