debugbyairbox Attack Hitbox Boundary Bug.rar (184.8 KB)
Initially, press X to attack while moving forward by 1 pixel. At this point, the enemy is contacted by the boundary of the attack hitbox.
The enemy successfully enters the hit reaction animation, but no damage visual effects or sound effects are triggered, and no HP is deducted. This appears to be a bug.
However, if you first press left to move and then press X to attack, the enemy will take normal damage, with visual effects and sound effects triggered, and HP decreases by 1%.