I really like this mode. Because it is a very good mod that enhances the experience without interfering with the gameplay.
However, adding this mod to some modpacks does not seem to load the textures properly.
I have no way of finding out if this is a problem with the mod or the texture pack.
But one thing is certain: there are times when it loads properly and times when it doesn't.

How does this problem occur

1. I was playing on btm4 modpack. (With this mode added)
2. Once it's finished loading, it randomly appears as an error block in-game
   It runs normally and the game is playable.
   

Seems to be an issue with the modpack? Something is probably interfering with block rendering. I can't really help with that unfortunately.