When you throw a snowball toward to a passable block(Especially plants and redstone elements), the snowball will be smashed when hit the passable block. it won't happen to arrows or tridents.

Affacted projectiles:snowball, egg, splash potion, lingering poition, ender pearl

Affacted blocks:all two-block-tall plants, grass, all flowers, crimson/warped fungus, seagrass, kelp, vine, weeping/twisting vine, crimson/warped roots, cobweb, tripwire (hook), all signs, all banner, all coral (fan), all sapling, fern, dead_bush, nether sprouts, sweet berry bush, red/brown mushroom, sugar cane, all crops, (soul) torch, lever, all button, all pressure plates, all opened fence gates