I dont know man. was the first time i played my mage in over 3 weeks. i feel barely any difference. Every other passive shows up when its active.
I just cant believe that combustion, the key passive doesnt. The other key passives do show up and since it took them almost a month to touch one of the main dmg sources of a build, i just dont believe them.
Maybe your increased dmg come from Burning instinct? It always showed 0% for me and after the patch its finally working as intended.