When on the obsidian platform in the end, it's possible to get a boat placed inside of a block next to it. This causes it to fall down through the platform and into the void or onto anything below the platform. If a mob gets into the boat before it falls, it will fall through with it. This does not appear to happen in the Overworld.
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[Mod] OcelotOnesie
Thank you for your report!
We're tracking this issue in MCPE-111785, so this ticket is being resolved and linked as a duplicate.
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