[GAMEPLAY] Spellblade (Sheen passive) is charging after the cast time rather than at the start

The spellblade passive on all Sheen items are charging after the cast time of abilities rather than on cast. This is a either a bug or an undocumented change that has a huge effect on mechanical gameplay. On previous patches spellblade was charged as soon as the cast time started - and this was intended behavior.

The easiest way to confirm this would be buying Sheen on Caitlyn then casting Q. You'll see that your spellblade buff only becomes active after the cast bar fills up and the projectile is shot.

This bug/change has crippled Corki as it takes the full cast time for spellblade to become charged on both his Q and R, meaning the mechanic to cast after the autoattack is in the air is almost impossible on his Q and extremely hard on his R.

Very old video of intended mechanic: https://youtu.be/ABYix52iBj0?t=268

On this patch spellblade charges only after the bar fills up. Picture of Caitlyn Q casting with Sheen: http://i.imgur.com/ureOBG1.png

I hope this bug is fixed or at least the change is acknowledged and documented very soon.