Ok, so I've searched enough, and I can't find any bug quite like this. If you were to throw around 20 xp bottles into a nether portal, and go into said nether portal, the game plays your usual loading screen and crashes. To be specific, the phone I am using is a Samsung J7 pro. Restarting your game should help until the bug is patched.
MCPE-73481
Xp bottle crash
Resolved
Duplicate
0
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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