When you enable caves and cliffs experimental and find a lush cave. Chances of finding the large dripleaf plant without the top part is relatively common. Sometimes it can generate normally. You can see in the image here a few dripleaf plants without their top leaf.
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We're tracking this issue in MCPE-125799, so this ticket is being resolved and linked as a duplicate.
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It also do it with the Tall Grasses in Lush Caves