Chromatic Cube Loss in place of Win by Concession
I had 2 losses . I won my next game when my opponent conceded when I Yorion'ed my Portal to Phyrexia. But instead, it was counted as my 3rd loss and my event ended.
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DAC169#34537 commented
For Draft problems go to https://mtgarena-support.wizards.com/hc/en-us/requests/new/ and select "Report a problem with my event."