Portenta H7 Bonjour

Hello everyone,
I used the bonjour library with Portenta H7 board. Everything works fine but when I try to announce a service on my net, the server returns this error:

It looks like the packet is not well formatted or the header has some problem.
The discovery is implemented on the "server" using the python library Zeroconf: zeroconf · PyPI
Here the github repository: GitHub - jstasiak/python-zeroconf: A pure python implementation of multicast DNS service discovery</ti

It is important to notice that this python implementation discovers every other bonjour services on the net.

Every help is appreciated.

Thank you.