diff --git a/miner/bid_simulator.go b/miner/bid_simulator.go
index baa2c9c1c5..6d98a34f58 100644
--- a/miner/bid_simulator.go
+++ b/miner/bid_simulator.go
@@ -519,6 +519,7 @@ func (b *bidSimulator) simBid(interruptCh chan int32, bidRuntime *BidRuntime) {
 
 	// ensure simulation exited then start next simulation
 	b.SetSimulatingBid(parentHash, bidRuntime)
+	bestBidOnStart := b.GetBestBid(parentHash)
 
 	defer func(simStart time.Time) {
 		logCtx := []any{
@@ -706,7 +707,12 @@ func (b *bidSimulator) simBid(interruptCh chan int32, bidRuntime *BidRuntime) {
 
 	bestBid := b.GetBestBid(parentHash)
 	if bestBid == nil {
-		log.Info("[BID RESULT]", "win", "true[first]", "builder", bidRuntime.bid.Builder, "hash", bidRuntime.bid.Hash().TerminalString())
+		winResult := "true[first]"
+		if bestBidOnStart != nil {
+			// new block was imported, so the bestBidOnStart was cleared, the bid will be stale and useless.
+			winResult = "false[stale]"
+		}
+		log.Info("[BID RESULT]", "win", winResult, "builder", bidRuntime.bid.Builder, "hash", bidRuntime.bid.Hash().TerminalString())
 		b.SetBestBid(bidRuntime.bid.ParentHash, bidRuntime)
 		success = true
 		return