Loading Error

When I try to play in any existing world, it freezes on the 'Loading Resources' screen, and I can't do anything except close the app. I have tried leaving it to load but my device just turns off after a couple of minutes. This has only been an issue for me since the 1.17 caves update. I have tried powering off my device and restarting it, but it didn't make a difference. I can still make new worlds. I do not have any resource packs except the default on my device