PaperMC/nms-patches/EntityAnimal.patch

--- a/net/minecraft/server/EntityAnimal.java
+++ b/net/minecraft/server/EntityAnimal.java
@@ -38,6 +38,9 @@
 
     }
 
+    /* CraftBukkit start
+    // Function disabled as it has no special function anymore after
+    // setSitting is disabled.
     public boolean damageEntity(DamageSource damagesource, float f) {
         if (this.isInvulnerable(damagesource)) {
             return false;
@@ -46,6 +49,7 @@
             return super.damageEntity(damagesource, f);
         }
     }
+    // CraftBukkit end */
 
     public float a(BlockPosition blockposition) {
         return this.world.getType(blockposition.down()).getBlock() == Blocks.GRASS ? 10.0F : this.world.o(blockposition) - 0.5F;