Major bug: Shaco's backstab procs don't apply stacks of Thunderlords

I couldn't test the full extent of this bug in customs but I was able to confirm that it took 4 basic attacks to proc thunderlords if either the first, or possibly any of the attacks proc Shacos passive.

Same went for attack-shiv-attack combo, it required 3 non-passive attacks and or spells.

I find this to be extremely detrimental to the majority of Shaco players right now(excluding the very few players who use other keystones) , not really unplayable but extremely disadvantged to the point where it's probably not worth playing him right now.