I FOUND THE SOLUTION! Went back to the material today to mess around and see what the issue was. I noticed a bunch of random regular nodes like noise wouldn't even show up properly in Cycles, and I eventually traced it back to the first UV Map node. All you need to do is uncheck the "from instancer" option in the UV map node at the very beginning and the material will work fine. For anyone else who came here looking for the issue that's the solution if it hasn't been fixed by the time you see this.