Work around to get "Flipped" Thin Instances working with a Lightmap?

Yeah it works with instances, but the concept here is to automatically convert them to thin instances which we have working. Buuuuuut when the scaling determinate is flipped it looks like it breaks the UV, which since they are thin instances I cant really do much about that other then perhaps create a custom shader that looks at the scaling determinate and flips the UV then?

If you look at where we ended up here, I just basically need to get this to work with lightmaps as well.