I'm not entirely sure if this is an inner light bug, or a combat metrics issue. Did some testing on PTS today.
Breton templar, wearing perfected false god, mother's sorrow, zaan, maelstrom inferno on backbar. I am
not using vampire bane/reflective light so am not accessing major prophecy through class skills. Only through inner light and spell power pots. Additionally, I've removed degeneration as part of my rotation so I also only have access to major sorcery through pots.
With inner light slotted on front bar, my Major Prophecy uptime hovers consistently throughout parses around 70%. However, Major Sorcery uptime is 100% which means pot uptime is fine.
Switched inner light to harness magicka (solely because it is also a skill I won't be actively using in a parse). Suddenly, my Major Prophecy uptime matches that of Major Sorcery as one would expect due to pot uptime.
Having it on both bars keeps it the same as having it on no bars (Major Prophecy matches that of Major Sorcery due to pot uptime, despite the fact that it should be higher since it's on both bars and I was a little slow on drinking my pot)
PC/NA
Mountain God | Leave No Bone Unbroken | Apex Predator | Pure Lunacy | Depths Defier | No Rest for the Wicked | In Defiance of Death
Defanged the Devourer | Nature's Wrath | Relentless Raider | True Genius | Bane of Thorns | Subterranean Smasher | Ardent Bibliophile
vAA HM | vHRC HM | vSO HM | vDSA | vMoL HM | vHoF HM | vAS+2 | vCR+2 | vBRP | vSS HM | vKA | vRG
Meet my characters :
IT DOESN'T MATTER BECAUSE THEY'RE ALL THE SAME NOW, THANKS ZOS