How It Works in Swing Through Grass

The rule is based on collision. Plants like tall grass, ferns, flowers, saplings and vines have no collision box - you can walk straight through them. When you left-click while aiming at one of these no-collision plants, the swing does not stop on the plant. Instead the game looks past it:

• If a mob or other attackable entity is in line behind the plant, your attack hits that entity for normal melee damage.
• If a solid block sits behind the plant, your left-click is applied to that block (you begin mining it) instead of breaking the plant.
• The plant itself is never broken by the swing - it stays rooted in the ground.

Solid blocks are unaffected: aiming at stone, dirt, or any block with a real collision shape mines it exactly as normal.