Unearth skill with Chaos Infusion support Basic attack no choas damage.

I have noticed a few glitches with supports, and this one breaks a possible build I was trying.
Chaos infusion is a legal support for unearth
(Supported attachs deal 25% of damage as extra chaos damage, deal 50% less damage)
I understand that the spell component does not have the the extra damage, but on the basic attack tab on the skill, that shows for the constructs basic attack, is also not showing any chaos damage numbers.