Use legacy unbound linking book texture

src/main/resources/assets/rivencraft/models/item/linking_book.json

@@ -1,6 +1,14 @@
 {
   "parent": "minecraft:item/generated",
   "textures": {
-    "layer0": "rivencraft:item/linking_book"
-  }
+    "layer0": "rivencraft:item/linking_book_unwritten"
+  },
+  "overrides": [
+    {
+      "predicate": {
+        "rivencraft:bound": 1.0
+      },
+      "model": "rivencraft:item/linking_book_bound"
+    }
+  ]
 }

src/main/resources/assets/rivencraft/models/item/linking_book_bound.json

@@ -0,0 +1,6 @@
+{
+  "parent": "minecraft:item/generated",
+  "textures": {
+    "layer0": "rivencraft:item/linking_book"
+  }
+}