The Bug

Igloos can generate with entrance detached from the body of the igloo. This is most likely cause by chunk borders as where the split occurs is at a chunk border

Reproduce

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Download the world with the world spawn at the issue here

Seed: -366938663825049798
Coordinates: /execute in minecraft:overworld run tp @s 1127.04 67.94 -4444.65 -68.56 7.05

Observed Result

The igloo was cut in half

Expected Result

The igloo wouldn't be cut in half