Tier 4 damage boost doesn't activate. Only can get up to tier 3, once you get the last multi kill to push it up to tier 4, it dropped off completely. Getting a grenade kill doesn't no longer instantly activate tier 4 either.
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Hi there, Thanks for your report. The situation you described with Path of Burning Steps is known to the team. Unfortunately, the only workaround currently available is to avoid going above 3 stacks for the damage boost. We realize this is far from ideal, and apologize for the inconvenience.