From what I understand Aya and Bayek are buried together, however there's a sarcophagus of Amunet (Aya) in Venezia in AC2 with a body in the Sarcophagus, is there an explanation for
Assassin's Creed Origins - How to Solve the Riddle in Layla's Cave
Assassin's Creed Origins: Amunet/Aya Body Explained (Bayek's Tomb) - YouTube
Assassin's Creed Origins - Bayek Buried Alive in the Sand - YouTube