If you put the boat on a block of slime and then sit in it, then it will jump. The greater the distance between the character and the boat, the higher the jump.

Thank you for your report!
We're actually already tracking this issue at MCPE-34577, so I will resolve and link this ticket as a duplicate.

That ticket has already been resolved as Won't Fix, which means this won't be fixed. Please do not leave a comment on the linked ticket.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

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Thank you for your report!
We're actually already tracking this issue at MCPE-34577, so I will resolve and link this ticket as a duplicate.

That ticket has already been resolved as Won't Fix, which means this won't be fixed. Please do not leave a comment on the linked ticket.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – ✍️ Feedback and Suggestions – 📖 Game Wiki

Fun fact: if you make it move by a Redstone clock and a piston. You will still be capable of performing the glitch. this works in the latest version of the game.