Tall grass shows a Dandelion Yellow before destroying it

When destroying a tall grass, facing west, a dandelion yellow quickly appears and dissappears before destroing tall grass.

What I expected to happen was...:
Just tall grass dissapearing/destroying

What actually happened was...:
a dandelion yellow quickly appears and dissappears before destroing tall grass.

Steps to Reproduce:
1. Face west in front of a tall grass
2. Click to destroy it
3. Watch a dandelion yellow appear and dissappear