Put a summary of the error you have here

What I expected was... :
I expected that the texture of the roots would not become darker due to the nearby blocks

What really happened was...:
The texture became darker because of the block next to it and it was not very logical

Steps to play:
1. Put a block of roots
2. With the previously placed block, place any other block
3. See strange changes in the color scheme of the block and the strange shadow in the block