scanning 10.20.7.2 with nmap: no result

[listhai]

Hello everyone,
I hope someone can help me.

nmap is ok
[root@test9 module]# nmap 10.20.7.2
Starting Nmap 6.40 ( http://nmap.org ) at 2023-12-09 16:56 CST
Nmap scan report for 10.20.7.2
Host is up (0.00062s latency).
Not shown: 996 closed ports
PORT STATE SERVICE
22/tcp open ssh
3300/tcp open unknown
6789/tcp open ibm-db2-admin
6839/tcp open unknown
Nmap done: 1 IP address (1 host up) scanned in 8.17 seconds

But when executing the NetDiscovery task, nmap: no result appears. Why?
Somebody can help me ? Thanks in advance.
[Sat Dec 9 16:07:55 2023][info] running task NetDiscovery
[Sat Dec 9 16:07:55 2023][debug] [http client] Using Compress::Zlib for compression
[Sat Dec 9 16:07:55 2023][debug] scanning block 10.20.7.1-10.20.7.254
[Sat Dec 9 16:07:56 2023][debug] creating 20 worker threads
[Sat Dec 9 16:07:56 2023][debug] [thread 1] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 1] scanning 10.20.7.1:
[Sat Dec 9 16:07:56 2023][debug] [thread 2] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 2] scanning 10.20.7.2:
[Sat Dec 9 16:07:56 2023][debug] [thread 3] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 3] scanning 10.20.7.3:
[Sat Dec 9 16:07:56 2023][debug] [thread 4] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 4] scanning 10.20.7.4:
[Sat Dec 9 16:07:56 2023][debug] [thread 5] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 5] scanning 10.20.7.5:
[Sat Dec 9 16:07:56 2023][debug] [thread 6] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 6] scanning 10.20.7.6:
[Sat Dec 9 16:07:56 2023][debug] [thread 7] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 7] scanning 10.20.7.7:
[Sat Dec 9 16:07:56 2023][debug] [thread 8] creation
[Sat Dec 9 16:07:56 2023][debug] [thread 8] scanning 10.20.7.8:
[Sat Dec 9 16:07:56 2023][debug] [thread 2] - scanning 10.20.7.2 with nmap: no result