diff --git a/op-batcher/batcher/fallback_auth.go b/op-batcher/batcher/fallback_auth.go
index 50f87b0f2a9..5fc279f74ac 100644
--- a/op-batcher/batcher/fallback_auth.go
+++ b/op-batcher/batcher/fallback_auth.go
@@ -43,6 +43,13 @@ func computeCommitment(candidate *txmgr.TxCandidate) ([32]byte, error) {
 // separate signature is needed — the L1 transaction is already signed by the TxManager's key.
 func (l *BatchSubmitter) sendTxWithFallbackAuth(txdata txData, isCancel bool, candidate *txmgr.TxCandidate, queue TxSender[txRef], receiptsCh chan txmgr.TxReceipt[txRef]) {
 	transactionReference := newTxRef(txdata, isCancel)
+	// The auth tx shares the batch txdata's identity (so a failure requeues the right frames)
+	// but is always a calldata tx. Auth failures must carry its real type: an ErrAlreadyReserved
+	// receipt labeled with the batch's blob type would make cancelBlockingTx cancel the wrong
+	// pool, leaving the reserving tx stuck.
+	authReference := transactionReference
+	authReference.isBlob = false
+	authReference.daType = DaTypeCalldata
 	l.Log.Debug("Sending fallback-authenticated L1 transaction", "txRef", transactionReference)
 
 	commitment, err := computeCommitment(candidate)
@@ -88,13 +95,13 @@ func (l *BatchSubmitter) sendTxWithFallbackAuth(txdata txData, isCancel bool, ca
 	// Submit the auth tx and wait for its receipt, then send the batch tx. Each Send
 	// blocks here when the queue is at its MaxPendingTransactions limit.
 	authReceiptCh := make(chan txmgr.TxReceipt[txRef], 1)
-	queue.Send(transactionReference, verifyCandidate, authReceiptCh)
+	queue.Send(authReference, verifyCandidate, authReceiptCh)
 	authResult := <-authReceiptCh
 
 	if authResult.Err != nil {
 		l.Log.Error("Failed to send fallback authenticateBatchInfo transaction", "txRef", transactionReference, "err", authResult.Err)
 		receiptsCh <- txmgr.TxReceipt[txRef]{
-			ID:  transactionReference,
+			ID:  authReference,
 			Err: fmt.Errorf("failed to send fallback authenticateBatchInfo transaction: %w", authResult.Err),
 		}
 		return
@@ -108,7 +115,7 @@ func (l *BatchSubmitter) sendTxWithFallbackAuth(txdata txData, isCancel bool, ca
 	if authResult.Receipt.Status != types.ReceiptStatusSuccessful {
 		l.Log.Error("Fallback authenticateBatchInfo transaction reverted", "txRef", transactionReference, "txHash", authResult.Receipt.TxHash)
 		receiptsCh <- txmgr.TxReceipt[txRef]{
-			ID:  transactionReference,
+			ID:  authReference,
 			Err: fmt.Errorf("fallback authenticateBatchInfo transaction reverted: %s", authResult.Receipt.TxHash),
 		}
 		return
diff --git a/op-batcher/batcher/fallback_auth_test.go b/op-batcher/batcher/fallback_auth_test.go
index c50dd6a69cd..51a40f1ffab 100644
--- a/op-batcher/batcher/fallback_auth_test.go
+++ b/op-batcher/batcher/fallback_auth_test.go
@@ -117,6 +117,61 @@ func TestFallbackAuth_AuthFailureRetried(t *testing.T) {
 	require.Len(t, queue.sends, 1)
 }
 
+// TestFallbackAuth_AuthFailureTxRefType verifies that an auth-tx failure is
+// reported under a calldata-typed txRef even when the batch txdata is blob.
+// The auth tx is always calldata; if its ErrAlreadyReserved failure were
+// labeled with the batch's blob type, cancelBlockingTx would send a calldata
+// cancel against a blobpool reservation, which is rejected the same way,
+// looping forever without ever displacing the stuck blob tx.
+func TestFallbackAuth_AuthFailureTxRefType(t *testing.T) {
+	l := newFallbackAuthSubmitter(t)
+	txdata := testFallbackTxData(t)
+	txdata.daType = DaTypeBlob
+	candidate := &txmgr.TxCandidate{TxData: []byte("batch-calldata")}
+
+	queue := &fakeTxSender{
+		responses: []txmgr.TxReceipt[txRef]{
+			{Err: errSendFailed}, // auth fails. No batch response, it must never be sent
+		},
+	}
+	receiptsCh := make(chan txmgr.TxReceipt[txRef], 1)
+
+	l.sendTxWithFallbackAuth(txdata, false, candidate, queue, receiptsCh)
+
+	got := <-receiptsCh
+	require.Error(t, got.Err)
+	require.Equal(t, txdata.ID().String(), got.ID.id.String())
+	require.Len(t, queue.sends, 1)
+	require.False(t, got.ID.isBlob)
+	require.Equal(t, DaTypeCalldata, got.ID.daType)
+}
+
+// TestFallbackAuth_BatchFailureTxRefType verifies the converse: a batch-tx
+// failure keeps the batch txdata's own type on the forwarded receipt.
+func TestFallbackAuth_BatchFailureTxRefType(t *testing.T) {
+	l := newFallbackAuthSubmitter(t)
+	txdata := testFallbackTxData(t)
+	txdata.daType = DaTypeBlob
+	candidate := &txmgr.TxCandidate{TxData: []byte("batch-calldata")}
+
+	queue := &fakeTxSender{
+		responses: []txmgr.TxReceipt[txRef]{
+			{Receipt: receiptWithBlock(100)}, // auth lands
+			{Err: errSendFailed},             // batch fails
+		},
+	}
+	receiptsCh := make(chan txmgr.TxReceipt[txRef], 1)
+
+	l.sendTxWithFallbackAuth(txdata, false, candidate, queue, receiptsCh)
+
+	got := <-receiptsCh
+	require.Error(t, got.Err)
+	require.Equal(t, txdata.ID().String(), got.ID.id.String())
+	require.Len(t, queue.sends, 2)
+	require.True(t, got.ID.isBlob)
+	require.Equal(t, DaTypeBlob, got.ID.daType)
+}
+
 func TestFallbackAuth_BatchFailureRetried(t *testing.T) {
 	l := newFallbackAuthSubmitter(t)
 	txdata := testFallbackTxData(t)