Rowing a boat underwater ejects player, disconnects all from multiplayer

I was rowing a boat and went into an upward slope of water like the one pictured.

I expected to float up the slope and remain above the surface of the water, similar to how a mining cart travels up a sloped track.

What happened was I remained level and went inside the water. I was ejected from the boat, which dropped to the bottom as an entity. This may or may not be intended, I do not know.

The other thing that happened that is definitely not intended was all players connected over LAN (I was hosting) were disconnected from the game.