change chain reader to use nil block number when reading unconfirmed …

…latest value (#13906)

.changeset/fresh-badgers-pull.md

@@ -0,0 +1,5 @@
+---
+"chainlink": patch
+---
+
+#internal change chain reader to use nil blocknumber when reading latest value

core/services/relay/evm/method_binding.go

@@ -115,15 +115,15 @@ func (m *methodBinding) blockNumberFromConfidence(ctx context.Context, confidenc
 		return nil, err
 	}
 
-	latest, finalized, err := m.ht.LatestAndFinalizedBlock(ctx)
+	_, finalized, err := m.ht.LatestAndFinalizedBlock(ctx)
 	if err != nil {
 		return nil, err
 	}
 
 	if confirmations == evmtypes.Finalized {
 		return big.NewInt(finalized.Number), nil
 	} else if confirmations == evmtypes.Unconfirmed {
-		return big.NewInt(latest.BlockNumber()), nil
+		return nil, nil
 	}
 
 	return nil, fmt.Errorf("unknown evm confirmations: %v for contract: %s, method: %s", confirmations, m.contractName, m.method)