Confirmed bug with Master Yi's Double Strike passive [GAMEPLAY]

Reposting something I already mentioned on reddit since this is probably a more fitting place for formal investigation: Reddit thread of same issue

The Issue

If you let Master Yi auto attack at will beyond a minimum attack speed, his first hit of his Double Strike passive will never crit, nor will the first auto after the Double Strike, which while not much of an issue early game, is a potentially significant nerf late game, and makes any builds with any real dependency on crit completely non-viable.

This is not trivial since with just Blade of the Ruined King or Youmuu's active (40% AS) and Highlander active alone at level 16 (80% AS) is enough to guaranteed trigger it.

The Steps

1. Pick Master Yi.
2. Get 100% crit chance (I had 2 Phantom Dancers, 4 Cloaks of Agility and 14% from runes).
3. Get enough attack speed (being level 15 and having 2 Phantom Dancers is enough, not sure exactly how much bonus attack speed is required, but 126.5% will get you it).
4. Auto attack a monster enough to proc Double Strike. Instead of critting like it should, the first hit will be a standard un-modified auto, the second hit will work as it should. Then after, the first auto attack after the Double Strike hits will also not critically strike.

Video Example

Finished uploading the video to Youtube: Clip of the bug in action

What you'll see in the video is Master Yi with well above 100% crit chance (absolutely should be critting every time) and 126.5% bonus attack speed (from being level 15 and 2 Phantom Dancers).

You'll notice whenever I allowed him to just attack red buff freely, a normal auto would (and should have) hit for 183. Based on this, a Double Strike should hit for 183 then 91-92, both of which should show crit icons showing that they were crits.

What actually happens is the first hit of the Double Strike is a standard, un-modified autoattack, that shows no crit icon, hitting for 91. The second hit works correctly and shows the crit icon and hits for 92 (since the second hit does half damage). However, when Master Yi was manually stopped between attacks, Double Strike worked correctly, with both procs doing the amount of damage they should have been doing.

Then if Master Yi also auto'd quickly after the Double Strike hits, he would fail one more time to crit.

Edit: Cleaned up the text to be more direct to-the-point.

Edit: bug found to only occur when attacking monsters, not minions or champions. Not as an impactful bug as first thought, however it does artificially deflate the effectivess of any gold spent on crit when jungling as Master Yi, not to mention significantly reducing his dps (and thus objective control) over Dragon and Baron.