Primal Split Fire Permanent Immolation interval changed from 1 to 0.5
This means, Brewmaster deals 20/40/60 damage per half a second now or in damage per second 40/80/120.
As you can see in the video down below (in action, it deals 43,88 dmg to the dummy unit, as it has a magic resistance of 26%)

So the tooltip should be changed to reflect that change.