This weapon shows that the skill ‘Savage’ converts its physical and acid damage into vitality damage. However, the ‘Savage’ skill doesn’t have acid damage; its damage is physical and lightning.
Maybe you should learn a bit more about damage conversions before claiming something is a bug.
This is not a bug.
There can be other sources of Acid Damage (from your weapon or whatever) that still go through the DAR attack of Savagery. That conversion can be useful, even if not for your build.
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