The Bug

I don't know if this is intentional or not. When you place a sand block in water, so it does falls directly, only the place where you placed the block and where it ends aren't anymore water sources. I would expect that all blocks the water sources would be destroyed on the path of the falling block.

How to reproduce

1. Build a 1-block wide column of blocks, 3 blocks tall or more
2. Place water sources all along one side of the column
3. Place a sand block inside the top water source and watch it fall through the water
   → Notice the water sources it falls through don't get deleted like the top one does

Expected behaviour:

All water sources the falling block falls through get deleted