Ignore this, see
Double-size plants (the ones that take up 2 blocks), when mined from the top always produce Sunflower particles (curiously this is damage value 0 for double-size plants), and tall grass doesn't drop stuff (unchecked) when mined from the top.
When mined from the bottom, the top part of the plant turns into a Peony (curiously, the last damage value for double-size plants, this was reported in
MC-53439) for a split second then goes away. If tall grass is mined from the bottom, it can drop itself without using shears, or drop a textureless block that turns into seeds in the inventory (possibly the entity dropping as a block instead of an item).
This could crash the game randomly.