Scalebane reads : “converts bleed chances from all sources to poison chance”.
The Bleeding Fury buff from bloodthirst node still gives bleed chance instead of poison chance with scalebane allocated.
It’s either a bug/oversight, or it needs clarification that it doesn’t work with scalebane, like the Sanguine Obsession node.
Scalebane would convert the bleed chance from Bleeding Fury stacks when you’re using Puncture, but not when you’re using another skill, since the Scalebane effect isn’t global. Scalebane & Bleeding Fury are two separate effects.