Yasuo invisible Attack Speed boost

Hello. In PBE, Yasuo seems to be getting a huge attack speed boost from nowhere. I took precision+sorcery and I was 1.08 Attack speed at level 1. This looked really high so I took another rune page with 0 attack speed(Inspiration+sorcery). And I started with 0.92 AS at level 1. In stats window, it showed ~0.65 base AS + ~0.26 extra AS This is a good change for me personally, since Yasuo got no offensive base stat buffs....but this looks like a bug, as this change isn't listed on surrender@20 as well. Can I get some clarity on this? and please keep this! Yasuo needs starting higher AS!
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