The bug
Player on a moving boat on top of unhydrated farmland glitches out of the boat when the farmland converts to dirt, causing the boat to break.
Steps to reproduce
This may require a few tries.
/fill ~-10 ~-1 ~-10 ~ ~-1 ~ farmland
Place a boat on top of the farmland.
/gamerule randomTickSpeed 300
Quickly row the boat.
Observed behavior
The player starts to stutter up and down and fall out of the boat, and the boat breaks.
Expected behavior
The player would continue riding the boat as normal.
I don't know why it's so hard for me to reproduce.
But the reproduce video looks plausible.