Barkskin bugged

Trying to use barkskin and after being hit when entering a map it will proc a few times then not work but the aura is still on and then im unable to gain the buff again. Playing werewolf.

I can also confirm this.

Sometimes, re-activating it makes it work, temporarily but after a short while, I'm not gaining any armor from my Energy Shield loss.

It definitely seems bugged.

+1 Barkskin not working properly. Not that this flat armour will save my Werewolf defenses, but I can hope it helps a little.

The bug seems related to anything that has to do with increasing Skill Duration.

After I un-specced the Skill Effect Duration nodes, alongside Blessing of the Moon, it seems to be working fine.

See also: https://www.pathofexile.com/forum/view-thread/3890821

Somebody there posted that after unspeccing any skill duration from the passive tree, it started working properly again.

A bit of a bummer honestly.