A few days ago my world started refusing to load. I would select the world and the progress bar would not advance then after a minute or so it would go to the brown screen and tell me "There was a problem loading this world." I searched for solutions online and some people suggested copying the world and trying to load the copy. I tried this. Invariably the game crashes, sometimes with a pink checkerboard, sometimes not. Usually when I restart Minecraft I get a message saying my save data was restored due to corruption. Upon trying the world again the same things happen. The original just won't load, copies cause the game to crash. I have several backups of this world so I resigned myself to losing some progress and loaded an earlier one. The same thing happens. Ditto for even earlier. I restored a version from my PSN cloud storage. Same thing. Often when I restore an older version it will load but if I save and quit it will start doing the same thing again. Sometimes it will let me save and quit twice before it won't load again, but never more than twice. I waited until the update came out today to try again hoping that that would fix it. No luck. I have cleared my cache and rebuilt my database several times, reinstalled Minecraft several times, even reset my PS5. Nothing helps. I'm not even doing anything on the world lately, just walking around, but after I save and quit, the world won't reload. Here are some things that may or may not matter: the world is 1.1 gb in size, I think this started happening right after the Dr. Seuss stuff started appearing on the main menu, this world was transferred to my PS5 from my PS4 several months ago and has been playing just fine almost every day since July, the most recent things I had done in the world were completing a trial chamber and finding a screaming goat and breeding more of them from it, my son often plays split screen with me and had gone through the trial chamber with me, I had just finished leveling a large sand area near my base, and several other people had played on the world recently using one-time guest accounts on the PS5. I don't know if any of these things are important to the problem. 

I'm sorry if this is a duplicate. I did search for the issue and found a few reports that seemed similar to what I was experiencing but not quite the same thing. I don't know if this is related or not.

Please advise me on what to do here. I do not want to have to abandon this world as there is a lot of work that has gone into it and many rare things that have been acquired (blue axolotls and most of the rare armor trims to name a couple). If I have to rebuild all of this from scratch I probably won't bother with it for a long time.