For whatever reason, using the aspects Sol Invictus(Solar) or Offensive Bulwark(Void), cause Precious Scars to still only work on kinetic weapon kills. Taking them off allows the Helmet to work properly again. It was like this in 8.0.0.4 and is still like this in 8.0.0.5.
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Can confirm as well. Precious Scars is activating restoration on Kinetic Kills and not solar ones when I use the solar subclass still.