My opponent didn’t lose at 0 life without protection from losing
In traditional ranked standard, I believe my opponent reached 0 life when my Urabrask’s forge token killed Aclazots with trample. Then they went from 0 life to 4 life. They didn’t have any cards that prevented losing on the field. I am on mobile so I am not sure if the game file attached from the app. Thanks

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DAC169#34537 commented
No bug, just a problem with how the game shows damage & lifelink. For some reason, Arena will first show the damage dealt and then show the health gained from lifelink, even though the damage & life gain from combat happens at the same time. So what with Aclazotz having lifelink & a power of 4, Arena first showed your opponent's health dropping to 0 and then increasing to its proper value of 4 due to the life gain from lifelink.