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There's no bug/issue visible in your screenshot. It should be green.
Fascinating, the whole time I've played on Germany the ground has been brown with yellow at the side of the road, just like in the curated Colorado Map. was it changed? or am I just going insane?
You're not insane -- it's a more recent change. I believe we changed it in May, when we introduced some new map editor tools/changes.
The old brown materials had been critiqued for a while.