All of my builds in my flatworld from 1.18.32 have been deleted if it was below Y0 as soon as I updated.
Broken world half of the world disappeared
Large chunks of builds below Y=0 get deleted.
Almost everything I built underground disappeared after 1.19.0 update.
Wild update deleted everything underground in Minecraft flat world
Everything below Y level 0 is reset upon insalling the Wild update and running previously created worlds.
Old flat world deleting blocks under y:00
All blocks placed below Y=0 in flat creative world deleted when updating to 1.19
Superflat Chunk Deletion?
Chunks of superflat worlds created before 1.18 have portions under "y=0" removed
Everything from Y -0 to Y -46 disappeared on super flat world after updating to 1.19
Chunks re-rendered in 1.19 have all blocks removed below y = 0
The wild update have deleted all buildings under the bedrock layer in my old flat world
Deletion of world underneath Bedrock.
Buildings Deleted after 1.19 Update
Everything Below y level -1 on a superflat world deleted
Chunk disappereance under y=0
Pre Caves and cliffs superflat realm all builds below y=0 are gone.