What I expected to happen
Nothing really, I just jumped while fishing because I was bored..
What actually happened
I died because apparently I "fell from a high place" even though I was on a boat.
Steps to reproduce
1 Place any boat on water (didn't check for other blocks, probably still works there)
2 Get on (not in!) the boat
3 Jump
4 Stop
This bug was actually hilarious to find, I laughed hard! 🙂
MC-157520 : Keeping jumping from a boat on water count as falling