Walls connect with Bamboo next to it

When you place a Bamboo plant next to a wall (any type), the wall connects to the bamboo, what shouldn't be the case I think. When the Bamboo grows, it isn't connected anymore.

What I expected to happen was...:
The wall stays like it is

What actually happened was...:
It connected with the Bamboo

Steps to Reproduce:
1. Place a wall
2. Place a bamboo plant next to it
3. The wall will connect to the bamboo