Map: Nests of the Fallen, Imperial Era, 1005 AG
Skill: Hammer Throw, more broadly Thrown projectile skills.
Whilst in the water gutter it is often possible for attacks to not create any projectiles whatsoever, not create them at certain angles or for the attacks to generate projectiles at incorrect angles on the Z axis. From the height of the terrain this is clearly not intended.
While I focus on a specific location in this image collection that shows some of the worst examples of this, it happens throughout this map.
Imgur library of bug examples: https://imgur.com/a/O4Jv4Nc