Toxic Lash no longer works the way it did before.
When hitting several enemies at once (be it melee or other kind of AoE), it now only applies the extra hit to a single enemy.
When hitting several multishot bullets at once, only a single Toxic Lash instance happens.
It also does not proc on every damage instance, as can be proven by simply bringing a weapon with a high fire rate and shooting at a single enemy. The enemy will end up having a lot less toxin procs than shots were fired.
Hitting Spore affected enemies with Toxic Lash infused melee weapons also no longer applies extra Toxic Lash instances for each spore.
Xata's Whisper, which is kind of an identical ability but with Void damage, still appears to work as normal. Which makes me think, was this an intended nerf? Did I miss patch notes?