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There is a bug with master yi where he can still be hit by skillshots while in his alphastrike untargetable mode. It might just be with yasuo ( who i was up against at the time. ) but when it happened once I was like okay weird but it was when it happened twice in the same game that I thought It should be reported. Im not actually sure if it works for all skillshots because there wasnt much to dodge but his own but thats where I really noticed it. I hope this can help you solve this problem and sorry I don't have any screenshots. It was project yasuo and chosen yi if that helps at all.