Basically what the title says. The tooltip says it should deal extra damage if the player hits from behind, and it doesn't. The particle and sound effects do activate, but the damage is the same as if landing a normal hit. I went to the configs and increased the multiplier just to be sure, and it has no effect either. I tested this using ToroHUD to show the mob's HP and damage particles. I should add that I haven't tried this in multiplayer so idk if this is only intended to work in PVP, but then why would the particle and sound effects be activated when hitting mobs as well?

Thanks in advance :)