UDP Scan of a responsive port

[waldeck () gmx de]

Scanning of a responsive UDP port with nmap 4.11 results in following effect:

IP 192.168.54.1.59311 > 192.168.54.148.7: UDP, length 0
IP 192.168.54.148.7 > 192.168.54.1.59311: UDP, length 0
IP 192.168.54.1 > 192.168.54.148: ICMP 192.168.54.1 udp port 59311 unreachable, length 36

Should not nmap expect an answer and discard the UDP packet?
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