I had a world on the Switch that froze for a while so I closed Minecraft, but ever since then when I try to load it, the whole application crashes. I have no idea why this is happening.
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Thank you for your report!
We're now tracking this issue at MCPE-45862, so we will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you have a copy of the world that is crashing still, you might like to upload a copy to MCPE-45862.
On Windows 10 you can use the Export world feature.
On Android or iOS you need to use a file explorer to navigate to Device storage > games > com.mojang > minecraftWorlds
On Xbox or Switch the only way is to upload it to a Realm, and then download the world on Windows 10 or Android/iOS.
If the world is larger than 10MB you can upload the world to OneDrive or a similar file sharing site, and then share the link.