The Bug
There is no bedrock at y=-64 when converting a world in 21w44a
Reproduce
Create a world in 1.17.1
Load this world in 21w44a
Go at y=-64
Observed Result
There will be no bedrock
Expected Result
There would be bedrock
There is no bedrock at y=-64 when converting a world in 21w44a
Create a world in 1.17.1
Load this world in 21w44a
Go at y=-64
There will be no bedrock
There would be bedrock
Relation to MC-239854