Porta Prison missing marker - where to go for the Kill Traitors objective Borderlands 3

This seems to happen if you pass through the area without completing the objective
Porta Prison missing marker - where to go for the Kill Traitors objective Borderlands 3
Porta Prison missing marker - where to go for the Kill Traitors objective Borderlands 3
Porta Prison missing marker - where to go for the Kill Traitors objective Borderlands 3

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