When using quark, the rooty dirt has the vanilla grass color.
https://imgur.com/a/ZFSeK

Quark greener grass compatibility has been added in the latest code push.

It has the wrong color because quark broke it with it's "greener grass" option. Turn the option off or deal with the color being wrong. Not my problem.

Quark is hugely popular and has some neat features. I'm relenting on my decision not to support it. I'll see what it takes to fix this minor issue.