[GAMEPLAY] Lux--Inconsistent damage calculations

League champion Lux no longer grants extra gold/damage bonus upon triggering her passive with an successful auto-attack or ultimate, when equipped with the support item Spellthiefs (along with the higher tiers of the item). For example, prior to the change to support items Lux was able to grant +8 gold from auto-attacks and +8 gold upon triggering the passive for a total of 16 gold (similar to champions like Bard and Lulu); however, now she is only able to grant +8 gold when triggering the passive ability with her auto attack. If the ability is designed to work like champion Nami's Tidecaller Blessing, I would understand; HOWEVER, Lux's passive combined with an auto-attack still triggers keystone mastery Thunderlord's Decree because both the passive and auto-attack are considered separate damage components. Therefore my reasoning of it being a bug is because damage calculations to support item Spellthiefs and keystone mastery Thunderlord's Decree are inconsistent for this particular champion. Please clarify.