Texture of crimson roots and warper fungi in inventory and item frame isn't same as it's model.
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its not totaly a bug since its based on a model.json fonction in minecraft like a ressource pack. they are displaying what they want. obiviously for the fungi mushroom its kinda weird to see those weird pixel falling down but for the crimson roots seem to be correct.
look foward for more explaination since all model are different from inventory from block and from droped item.