Punch THROUGH the boat (causes no damage to it)

So i was in a boat and i was heading back to my private island in a swampland, I am approaching shore and since i want to save the boat i punch at it to break it in one piece (a trick i have used since 1.2.5).

What i expected:
The boat would drop as an item

What happened:
I managed to punch a dirt block on the sea floor right THROUGH the boat itself, the boat did not show any signs of damage being dealt to it.