Get a Free 3-6 Star Baron Zemo this Week!
Log in to the Summoner's Market at https://store.playcontestofchampions.com/ and claim the Baron Zemo Selector between 10am PT November 24 and 10am PT on December 1st.
Proven and Below: 3-Star
Conqueror/Uncollected: 4-Star
Cavalier/Thronebreaker: 5-Star
Paragon/Valiant: 6-Star
You can only claim this Baron Zemo one time. The Baron Zemo is delivered as a selector, claiming it will require you to choose your rarity immediately. If you plan to change your Progression level during the Cyber Week event, we suggest you wait until you have made that change before claiming this selector.
Log in to the Summoner's Market at https://store.playcontestofchampions.com/ and claim the Baron Zemo Selector between 10am PT November 24 and 10am PT on December 1st.
Proven and Below: 3-Star
Conqueror/Uncollected: 4-Star
Cavalier/Thronebreaker: 5-Star
Paragon/Valiant: 6-Star
You can only claim this Baron Zemo one time. The Baron Zemo is delivered as a selector, claiming it will require you to choose your rarity immediately. If you plan to change your Progression level during the Cyber Week event, we suggest you wait until you have made that change before claiming this selector.
Due to issue with the "Not Another Anime Reference" Solo Event, we will be disabling the event for the time being. We will return the event at a future date when the issues have been resolved. We apologize for the inconvenience.
Despair Mastery Bugged? (Not reversing regen)

Description for despair mastery: Debuffs applied to enemies reduce their healing and Regeneration effects by X% each.
With Despair 3/3 each debuff reduces healing by 15%.
At 6 debuffs, you get 15 x 6% = 90% healing reduction. 7 debuffs, 105% and 8 debuffs, 120%.
As seen in this video, despair is not reversing the regen after 7 stacks of debuffs.
https://www.youtube.com/watch?v=Rw-M4meda14
There's no reason why despair should not be able to reverse regen when there are champions with petrify abilities that are capable of reversing regen. Please look into fixing this.
With Despair 3/3 each debuff reduces healing by 15%.
At 6 debuffs, you get 15 x 6% = 90% healing reduction. 7 debuffs, 105% and 8 debuffs, 120%.
As seen in this video, despair is not reversing the regen after 7 stacks of debuffs.

There's no reason why despair should not be able to reverse regen when there are champions with petrify abilities that are capable of reversing regen. Please look into fixing this.
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Comments
Don't need a fix. It's not broken.
They would need to take in consideration champions that can do an infinite amount perma debuffs in the fight, which would may lead to a cap (aka, indirect nerf)
That is simply your assertion that it is not supposed to work that way. On paper the description is pretty much the same as the description for petrify debuffs, which do reverse regen
As another example, with two petrify rebuffs Void reduces healing by 100%. With points in despair you can have between 110-130% healing reduction, resulting in some regen reversal. In effect when you have the despair mastery, each debuff should work as a small 5% to 15% "petrify" (without the power gain reduction) but it's currently not behaving this way.
Very few champs can stack an infinite amount of debuffs in the way you describe. The only one I can think of is KG. Even for havok those debuffs drop off after 10 stacks.
Despair does not work as a petrify. They are two different mechanics
Do you have a link to an official moderator response? Personally I don't think allowing despair to reverse regen unbalances the game, it opens up more champions to be viable for countering regen instead of relying on the same few champs.