After the new update I went to my full playthrough save to see the beach scene for Akai but it tells me that I don't have it unlocked yet, but also shows me that I have 4/4 scenes
Try to talk with Akai and select the choice "Ask about Akai". There is a chance you don't have the scene yet, and the counter for the number of scenes you have unlocked is wrong.
After the new update I went to my full playthrough save to see the beach scene for Akai but it tells me that I don't have it unlocked yet, but also shows me that I have 4/4 scenes