core/types: fix deposit request encoding

core/types/deposit.go

@@ -32,7 +32,7 @@ func DepositLogToRequest(data []byte) ([]byte, error) {
 	}
 
 	var outputRequest = make([]byte, depositRequestSize)
-	outputRequest[0] = depositRequestSize
+	outputRequest[0] = depositRequestType
 	const (
 		pubkeyOffset         = 1
 		withdrawalCredOffset = pubkeyOffset + 48

core/types/deposit_test.go

@@ -86,6 +86,9 @@ func FuzzUnpackIntoDeposit(f *testing.F) {
 		if err != nil {
 			t.Errorf("error unpacking deposit: %v", err)
 		}
+		if len(got) != depositRequestSize {
+			t.Errorf("wrong output size: %d, want %d", len(got), depositRequestSize)
+		}
 		if !bytes.Equal(enc, got) {
 			t.Errorf("roundtrip failed: want %x, got %x", enc, got)
 		}