When a chorus flower is dropped from a chorus tree, it will use the texture when they reach age 5 instead of using the texture when they are still growing or still at age 1 to 4. That's because when you create a chorus tree and the flower stopped growing (using age 5 texture), the item form of the chorus flower gets confused when the dead variant of the chorus flower dropped as an item before you drop the alive variant of the chorus flower. You need to set your randomtickspeed to 4096, wait for the chorus flower to grow into a tree, reset your tickspeed, shoot the flower with a bow or crossbow and you get the item entity of the flower.