I decided to go into the nether, but when I enter it, the game crashes.
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Comments 2
Thank you for your report!
We're actually already tracking this issue at MCPE-66678, so I 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.
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I have had to back up my files often for this reason because it would cause problems reloading the game file after it crashes.