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This bug will happen if you one shot vivian or kill her before she transform her pet (her pet will transform when vivian or the pet reach 50%), vivian will die but the pet wont and you will stuck there
so people that use one shotter (cermia, cdom, luna, etc) is the one that experience this bug mostly, just dont one shot her, let her transform her pet first, otherwise that pet will punish you from destroying its beloved "nest"