https://files.catbox.moe/eb4wvp.png
I have never seen this anywhere. This could be as rare as 5-6 tall cactus.
Edit - Check comments for seed/coords
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Seed + version + coords would probably interest the minecraft@home discord
Sorry, I wanted to add the seed/coords via comment but forgot. Will add them tomorrow.
I have never seen a 2 tall melon. Whats the seed?
Melon seed probably