wrong TTL with multicast on

void loop() {
  // check the network connection once every 10 seconds:
  size_t ret;
  ret = Udp.beginPacket(ip, 12345);
  ret = Udp.write("This was a triumph", 18);
  ret = Udp.endPacket();


Notice the TTL warning in wireshark. I greped around the WiFiNINA library, but could not find a way to set the TTL for anything other than ICMP packets. Bug?