fix(items): add check for PDC

Author: ybw0014

dough-items/src/main/java/io/github/bakedlibs/dough/items/ItemUtils.java

@@ -115,6 +115,11 @@ public static boolean canStack(@Nullable ItemStack a, @Nullable ItemStack b) {
                 return false;
             }
 
+            // PersistentDataContainer
+            if (!aMeta.getPersistentDataContainer().equals(bMeta.getPersistentDataContainer())) {
+                return false;
+            }
+
             // Display Name
             if (aMeta.hasDisplayName() != bMeta.hasDisplayName()) {
                 return false;