ps4/ps5 saving world problems

Hi  

I am playing minecraft ps4 online multiplayer but on ps5 and I am having problems saving my world. It keeps getting stuck and I have to reset the game and when I go back into my world all my stuff I did before is gone and I am taking 4 to 5 hours of game time. It's all gone and it's frustrating because this is the second time I had  to start over. So if you could fix this that would be amazing. Thank you so much for your time and I hope to hear from you soon.