The thing is, there's an increase in weapon damage since if you hit your target after stacking the 3 charges, even tho it won't show
in your character sheet nor addons, the damage you deal is increased but not as much as before this bug happened. I mean, I can understand that sets like Witch Knight Defiance won't show the 5th piece bonus on the character sheet because it's a conditional bonus based on the enemy's status effect and it should be calculated in real time as a parameter, but what's the reason of Molten Whip not being displayed as it was before like every other buff? Maybe the calculations are not made where they should be (Skill weapon power) and they might be added as plain damage increase (like bloodthirsty) which could be the reason of the bonus not showing up in the character sheet.

If that's the case, for raw damage builds the bug would make a noticeable difference (which is what I'm feeling based on my previous numbers) because it wouldn't be adding to the total weapon damage that gets multiplied later by the % modifiers (15+3+3+30) but just added like bloodthirsty does at the end of the calculations.

So yeah, I might be mistaken but it's what I'm feeling and what I ended up wondering after doing some parses months ago, when I noticed the bug not by the UI but by the numbers.