Plants like flowers, grass, fern and other are generating in caves on dirt blocks.
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We're tracking this issue in MC-30755, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate ofย MC-30755, which was later resolved as "Works As Intended".