--- a/net/minecraft/network/syncher/SynchedEntityData.java
+++ b/net/minecraft/network/syncher/SynchedEntityData.java
@@ -146,6 +148,13 @@
 
     }
 
+    // CraftBukkit start - add method from above
+    public <T> void markDirty(EntityDataAccessor<T> datawatcherobject) {
+        this.getItem(datawatcherobject).setDirty(true);
+        this.isDirty = true;
+    }
+    // CraftBukkit end
+
     public boolean isDirty() {
         return this.isDirty;
     }
@@ -235,6 +244,18 @@
         return this.itemsById.isEmpty();
     }
 
+    // CraftBukkit start
+    public void refresh(ServerPlayer to) {
+        if (!this.isEmpty()) {
+            List<SynchedEntityData.DataValue<?>> list = this.getNonDefaultValues();
+
+            if (list != null) {
+                to.connection.send(new ClientboundSetEntityDataPacket(this.entity.getId(), list));
+            }
+        }
+    }
+    // CraftBukkit end
+
     public static class DataItem<T> {
 
         final EntityDataAccessor<T> accessor;