Poison damage/corrosion support with Barbs support

Hello,

The formula of poison explaining the poison damage is calculated pre mitigation (so before applying any enemy resistance/armor).

In my case I have a spear : Splinter of Lorrata (with a very poor native source of damage 8-19 phys damage) / a lot of thorns (around 1000 dmg) / a poison chance of 100% (with gloves) / barbs support / corrosion support.

Normally, each time barbs is triggered, the poison should apply 20% of physical damage (with 0 poison magnitude) of the spear damage + thorns damage then corrosion support should break a lot of more armor when this happens...

The problem here is, whether barbs apply or not, the poison amount remains the same. I can't break armor quickly with this bug.

Could you fix this issue ?

Thank you

Edit : I found an older thread about his subject, https://www.pathofexile.com/forum/view-thread/3750899/page/1#p26342183
So this bug exist since april 2025

Edit : I have test with another lambda spear, it's the same (so the bug il not link to lorrata spear)