NetError when using netUDP_Send() multicast with different IP-Ranges

Hello, first at all, sorry if I ask a question that is solved here in the past. The search function in the forum seems to do not work…

My problem is to send a UDP-Multicast from a PC (10.1.2.3/255.255.0.0) to a STM32-Board with an IP away from its range. For Example 132.0.6.30/255.255.0.0.

If I use the same configured UDP-Socket, but with a remote IP of 132.0.6.20 it works. Also a remote configuration of 132.0.1.19 works.

At my knowledge, I expect that in case of UDP-Multicast the IP-Range of the Clients do not take care when both clients are in the same multicast-group.
Are there any checks inside the netUDP_Send()-Function they returns “NetError” if the IP-Ranges of host and remote is too far away from each other?

An overview of my configuration:
PC-side:
10.1.2.3(255.255.0.0)

STM32:
MDK Network Component V 7.10.0
netIGMP_Join(0, sgroup); // sgroup = 224.0.5.128
netUDP_SetOption(socket, netUDP_OptionTTL, 2); // socket = 2
sendbuf = netUDP_GetBuffer(rply_len);
netUDP_Send(socket, remoteAddr, sendbuf, rply_len); // remoteAddr = PC-IP-Address

Thanks a lot for all advice!