Structure blocks can be waterlogged

Summary:
Structure blocks can be waterlogged.

Steps to Reproduce:

1. Create a new world with cheats enabled

2. Enter the command /give @s structure_block

3. Place the structure block down

4. Sneak and use a water bucket on the structure block

Observed Results:
The structure block is waterlogged.

Expected Results:
The structure block should not be waterlogged as it is a full block. The water should instead be placed next to the structure block.