'Empty space between two ground objects in unity (Infinite scrolling)

I am trying to create an endless runner which has infinite scrolling ground. I am using two same ground objects and resetting their position after it's scrolled to left more than its width. However, when it's scrolling there's a small gap between two ground objects. How can I fix this?

Issue

ground controller script

collider and rigid body attached to ground object



Sources

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Solution Source