PaperMC/nms-patches/DataWatcher.patch

--- a/net/minecraft/server/DataWatcher.java
+++ b/net/minecraft/server/DataWatcher.java
@@ -128,6 +128,13 @@
 
     }
 
+    // CraftBukkit start - add method from above
+    public <T> void markDirty(DataWatcherObject<T> datawatcherobject) {
+        this.b(datawatcherobject).a(true);
+        this.g = true;
+    }
+    // CraftBukkit end
+
     public boolean a() {
         return this.g;
     }