Nodes giving chance to poison on hit with spell damage do not work for impending doom.

EDIT: Upon further testing, it appears that the issue is just a lying character sheet issue. I am not totally certain, but it seems that the chance is actually applying.

The nodes in the cluster with "Serpentine Spellslinger" granting "chance to Poison on Hit with Spell Damage" are not working for the Doom Blast skill triggered by the Impending Doom support. As it is a triggered skill, I could understand this not working if the nodes said spell skills have a chance to poison. However, it says spell damage has a chance to poison and I am pretty sure Doom Blast deals spell damage.

This is kind of messing up my build plan.