[MC-219525] In the frozen ocean biome, icebergs at the top get cut off at the bottom by the water and below it inside a cave will make a flat straight pillar of ice

Here is the iceberg bug, I had to upload it to YouTube because the screenshots wouldn't really show it that well.

Linked issues

Duplicate of MC-214823

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We're tracking this issue in MC-214823, so this ticket is being resolved and linked as a duplicate.

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