🤔

I think this was because Quark walls don't extend BlockWall. It's a bit messy to extend as you have to include the vanilla variant property to prevent a crash then ignore it in the state mapper and metadata.

Yes, but why do vanilla walls connect to Quark walls then?

Oh, I read that backwards, though its srill technically true. Vazkii probably has the old code walls used to connect in his copy, and it changed in vanilla.