--- a/net/minecraft/world/entity/ai/attributes/AttributeMap.java
+++ b/net/minecraft/world/entity/ai/attributes/AttributeMap.java
@@ -162,4 +_,12 @@
             }
         }
     }
+
+    // Paper - start - living entity allow attribute registration
+    public void registerAttribute(Holder<Attribute> attributeBase) {
+        AttributeInstance attributeModifiable = new AttributeInstance(attributeBase, AttributeInstance::getAttribute);
+        attributes.put(attributeBase, attributeModifiable);
+    }
+    // Paper - end - living entity allow attribute registration
+
 }
