Turning a Puddle into an Ocean with both Water and Lava

Put the summary of the bug you're having here

When placing a bucket of water or lava you get the regular outcome of doing so. However, when you place a block within the water or destroy a block ANYWHERE NEAR the water. Something rather destructive happens.

It causes the water to like multiply by x500 and just flood everywhere. I've attached a screenshots of players flooding islands.

Steps to Reproduce:
1. Get a Bucket of Water or Lava
2. Place a block within the liquid or destroy a block near it.
3. It happens.