Put the summary of the bug you're having here
What I expected to happen was...:
I expected to not be able to place the water, upon placing the water I expected the item to have dropped.
What actually happened was...:
Water was allowed to be placed, and no item dropped.
Steps to Reproduce:
1. Place any button or a ladder on a block.
2. Place a block beside the block that the button or ladder occupies.
3. Place water against the second block that was placed.