Fix object block replacements on Paper 26.1.2

Paper 26.1.2 caches block data that names every state without the parsed
states BlockData#merge needs, so replacing blocks inside objects threw
on every placement. Such block data replaces the base completely, so
B.merge returns it directly.

Model used: Claude Opus 5.5

core/src/main/java/com/volmit/iris/engine/object/IrisObject.java

@@ -966,7 +966,7 @@ public class IrisObject extends IrisRegistrant {
                                 BlockData newData = j.getReplace(rng, i.getX() + x, i.getY() + y, i.getZ() + z, rdata).clone();
 
                                 if (newData.getMaterial() == data.getMaterial() && !(newData instanceof IrisCustomData || data instanceof IrisCustomData))
-                                    data = data.merge(newData);
+                                    data = B.merge(data, newData);
                                 else
                                     data = newData;
 

core/src/main/java/com/volmit/iris/util/data/B.java

@@ -358,6 +358,15 @@ public class B {
         return true;
     }
 
+    public static BlockData merge(BlockData base, BlockData overlay) {
+        // Paper 26.1 caches block data that names every state without the parsed states merge needs. Merging it would
+        // replace every state of the base anyway.
+        if (overlay.getAsString(true).equals(overlay.getAsString())) {
+            return overlay;
+        }
+        return base.merge(overlay);
+    }
+
     public static boolean isFoliagePlantable(BlockData d) {
         return d.getMaterial().equals(Material.GRASS_BLOCK)
                 || d.getMaterial().equals(Material.MOSS_BLOCK)