Simply changing it to 2-sided does not resolve the issue for me. It seems the original post did a lot of work to the material to get it to work but I’m not sure what to do with mine. On all the ones I see this issue with (basically every model from Speedtree that isn’t the plain Desktop version, so the bare version of trees and the seasonal versions) the base/diffuse texture isn’t even in the material, instead it has a vector node set to a plain blue with 0,0,1 set up for the normal and a few other odds and ends so it seems the original post was even more well off than what is currently happening.