My Xbox is telling me that a local save of a Minecraft world has been downloaded but it...

You might be lucky, that the cloud save hasn't been updated with the crashed world yet.

In that case, try the following:

Go to the Minecraft tile in "My Games and Apps", and press the Menu button. Choose to manage the game.

WARNING! The following steps will delete the local save storage! If the other worlds haven't been synced with the cloud, your saves will be gone!!!

So if you are willing to take that step, clear the LOCAL save storage of your Minecraft game.

DO NOT choose to delete the games from all consoles (i.e. the cloud storage)!!!

With the local save gone, start Minecraft.

The console will then try to re-sync the local saves from the cloud.

If that worked, you might have a working world from a previous save.

To prevent such things happening in the future, consider backing up your worlds regularly with these instructions: https://help.minecraft.net/hc/en-us/articles/360034754912-Backing-up-Minecraft-worlds-

For this you will need to copy your world and make it available in a forum for download. Regular Minecraft save worlds to %USERPROFILE%\AppData\Roaming\.minecraft\saves\, Windows 10 edition saves worlds to %USERPROFILE%\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\
LocalState \ games \ com.mojang \ minecraftWorlds. Worlds are saved in different formats so you cannot copy worlds from java based version to windows 10 version.

this file worked for "C:\Users\Your PC Name\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds"

Thank you for responding. Is there any way you can tell me how I would see if my cloud save has been overwritten by my local save?

I believe the Minecraft mods are stored locally and are not linked with your Microsoft account. You might be able to transfer the mods by hosting a modded Minecraft world on your PS4, and then joining that hosted world with you PS5. When it asks if you want to download resources/behavior packs, click yes. I believe that this should save those mods as cached data on your PS5 version of Minecraft.

It has been a few years since I modded Minecraft and I don't have any PlayStation console so I might be wrong on the transfer...

Downloading the profile again linked it to the correct local profile so it worked!

All the saved app data like Minecraft worlds is accessible!

Thanks for all your help.