If a fishing line (specifically the bobber entity) goes through a nether portal or end portal, the game will crash.
How to recreate:
Create and activate a nether or end portal.
Create a fishing rod.
Cast the fishing rod through the portal.
The game should crash. This may take a couple tries.
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We're tracking this issue in MCPE-154161, so this ticket is being resolved and linked as a duplicate.
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