"Whatever Floats Your Goat" achievement does not require floating in water

Summary:
The achievement "Whatever Floats Your Goat" has the following description:

Get in a boat and float with a goat

However, the achievement does not require floating, it just requires getting in the boat.

Steps to Reproduce:

1. Create a new world with cheats disabled
2. Find a goat in a mountains biome
3. Put the goat in a boat
4. Get in the boat

Observed Results:
The achievement is unlocked.

Expected Results:
The achievement should only be unlocked when the boat is floating in water.