Boss Challenge Darkness Stacks Bug is back

As title says the old bug that when you into the dark on your way to the boss and get more than 5 stacks it doesnt count as completed for the boss challenge even if you threw all the flares during the fight and never had a single stack. Just happened to me. I will now have to look for another totli. Omg. I thought I Was finally done. #literallyheartbroken #foreverat35challenges

edit 1: Refering to this bug:

"Fixed a bug where the "Defeat Ahuatotli, the Blind without gaining more than 5 stacks of Darkness Debuff" challenge would fail to complete if you had gained Darkness stacks prior to the boss encounter, such as while being escorted by the Crawler."

Supposedly fixed in Patch 3.4.3e
https://www.pathofexile.com/forum/view-thread/2235236