If you've played Minecraft for a while and gone adventuring on the high seas, you may have noticed an unusual phenomenon in large bodies of water. Large rectangular-prism pockets of air may sometimes generate a few blocks on or under the ocean surface.
These appear when abandoned mineshafts have generated or attempted to generate under the ocean floor. The air pockets would have been filled by an "entrance" to the mineshaft had there been the right type of blocks there.
All structure generation is canceled by the presence of liquid within a component's bounding box, but the critical/initial parts do execute some generation routines. For example, the End portal room of a stronghold will generate wherever it tries to, though it might be alone if other potential components intersect standing liquids. Evidently, the block-clearance code for mineshafts executes before the liquid check, resulting in the strange air bubbles.
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