I was messing around in the most recent snapshot as of this time, 21w41a, and I happened upon one of the azalea trees that mark lush caves growing out of an iceberg. This seems odd to me so I figured that mojang might want to make it so that the dirt block and tree cannont grow out of the ice varients.
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We're tracking this issue in MC-239237, so this ticket is being resolved and linked as a duplicate.
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DuplicatesΒ MC-239237