Put the summary of the bug you're having here
Tnt destroys blocks even though it was in water

What I expected to happen was...:
It wouldn't destroy any blocks

What actually happened was...:
it caused a lot of damage to the machine

Steps to Reproduce:
1. dig a 3x3 hole, and fill with water
2. put tnt around the middle source
3. activate all tnt at the same time