chore(engine): warn on inconsistent pipeline (#3623)

crates/consensus/beacon/src/engine/mod.rs

@@ -385,6 +385,13 @@ where
             // If the checkpoint of any stage is less than the checkpoint of the first stage,
             // retrieve and return the block hash of the latest header and use it as the target.
             if stage_checkpoint < first_stage_checkpoint {
+                warn!(
+                    target: "consensus::engine",
+                    first_stage_checkpoint,
+                    inconsistent_stage_id = %stage_id,
+                    inconsistent_stage_checkpoint = stage_checkpoint,
+                    "Pipeline sync progress is inconsistent"
+                );
                 return self.blockchain.block_hash(first_stage_checkpoint)
             }
         }