When I load my very old world, it loads up to 100% and then freezes and crashes. I'm not sure what to do, I've tried replacing the .dat files and I've tried optimizing the chunks to the most recent version but it didn't do anything. Any help would be appreciated. I'm running Windows 10 on the most recent version of the launcher (I'm pretty sure). I'm not sure how to post my save here so let me know how to do that too.