PS5 world not saving after playing for a few hours in multiplayer, autosave not working

Created a new world with my friend, played for about an hour and left for a while. Came back a few hours later and played on the world for about 3 hours. I never noticed the "autosave" icon. I went to save and it got stuck, was taking forever so I left it. I came back an hour later after eating food and it was still on "saving", so I closed the game and relaunched it. When I opened it I noticed none of our progress has saved since the last time I joined. So we went through and got roughly back to where we were and signed off for the night. It got stuck on saving so I went to bed, left it on and in the morning noticed the game had crashed. Upon launching and rejoining the world. I realised once again, nothing has saved and we were back to where we wh|renwhen I first logged off