Wooden Pole resets after saving

When I set the length of a wooden pole to the length of a smal wooden block and save it, the lenght of the wooden pole gets reset.

Wooden pole before saving:

Wooden pole after saving:

I'm from germany, so pls excuse my bad english ;D
This makes sense, as you are exploiting a bug to make smaller wooden poles. The pole still has the ID of a double wooden pole, so when it loads, it loads that.

In some cases it doesn't load the actual block, and instead keeps the single wood block.