address review comment

chia/full_node/full_node.py

@@ -501,12 +501,13 @@ async def _handle_one_transaction(self, entry: TransactionQueueEntry) -> None:
         try:
             inc_status, err = await self.add_transaction(entry.transaction, entry.spend_name, peer, entry.test)
             entry.done.set((inc_status, err))
-            # if the transaction is valid, it was added to the mempool and we
-            # don't need to keep it in _recent_txs anymore
-            try:
-                self._recent_txs.remove(entry.spend_name)
-            except KeyError:
-                pass
+            if err is None and inc_status == MempoolInclusionStatus.SUCCESS:
+                # if the transaction is valid, it was added to the mempool and
+                # we don't need to keep it in _recent_txs anymore
+                try:
+                    self._recent_txs.remove(entry.spend_name)
+                except KeyError:
+                    pass
         except asyncio.CancelledError:
             error_stack = traceback.format_exc()
             self.log.debug(f"Cancelling _handle_one_transaction, closing: {error_stack}")