PaperMC/nms-patches/EntityDamageSourceIndirect.patch

--- a/net/minecraft/server/EntityDamageSourceIndirect.java
+++ b/net/minecraft/server/EntityDamageSourceIndirect.java
@@ -29,4 +29,10 @@
 
         return itemstack != null && itemstack.hasName() && LocaleI18n.c(s1) ? new ChatMessage(s1, new Object[] { entityliving.getScoreboardDisplayName(), ichatbasecomponent, itemstack.B()}) : new ChatMessage(s, new Object[] { entityliving.getScoreboardDisplayName(), ichatbasecomponent});
     }
+
+    // CraftBukkit start
+    public Entity getProximateDamageSource() {
+        return super.getEntity();
+    }
+    // CraftBukkit end
 }