Paper/paper-server/nms-patches/net/minecraft/world/damagesource/EntityDamageSourceIndirect.patch

--- a/net/minecraft/world/damagesource/EntityDamageSourceIndirect.java
+++ b/net/minecraft/world/damagesource/EntityDamageSourceIndirect.java
@@ -38,4 +38,10 @@
 
         return !itemstack.isEmpty() && itemstack.hasCustomHoverName() ? new ChatMessage(s1, new Object[]{entityliving.getDisplayName(), ichatbasecomponent, itemstack.getDisplayName()}) : new ChatMessage(s, new Object[]{entityliving.getDisplayName(), ichatbasecomponent});
     }
+
+    // CraftBukkit start
+    public Entity getProximateDamageSource() {
+        return super.getEntity();
+    }
+    // CraftBukkit end
 }