Corruption and CoA consuming Shadow Vulnerability charges

[forlorn]

Shadow Vulnerability is being consumed by Corruption ticks, when the tooltip for the Improved Shadow Bolt talent clearly states that it shouldn't. The bug occurs in a random fashion.

Your Shadow Bolt critical strikes increase Shadow damage dealt to the target by (4%/8%/12%/16/%20%) until 4 non-periodic damage sources are applied. Effect lasts a maximum of 12 sec.

*Edit* Curse of Agony also appears to have this consuming effect.

[nervous]

The first tick of drain life/drain soul also appears to be doing this. Only the first tick seems to consume the charge, and if SV appears after corruption/coa/etc are already applied, charges are not consumed.

[forlorn]

Looks like you're right nervous, the charges are never consumed if the debuff is applied after shadow damage dots or drains are on the target, but only vice versa.