UDP packets don't reach the destination when inline XML configuration for IP-addresses used

[andrew-lukin]

When I'm using inline XML configuration for IP-addresses with .x type wildcard, it configures a netmask to be as minimal as possible with provided IP-addresses. Like with 192.168.1.26 and 192.168.1.31 it will go for /27 netmask. However, then UDP packets sent through the switch get stuck forever somewhere in the switch's bridging.
Either adding higher octet values to set it to /24 or explicitly specifying netmask='/24' solves the issues and packets go smoothly.

Omnet++ 6.1, INET 4.5.4

Example:
ned file:

network netmask_bug extends TsnNetworkBase
{
    parameters:
        *.eth[*].bitrate = default(1Gbps);
    submodules:
        scenarioManager: ScenarioManager {
        }
        
        Node1: TsnDevice {
            gates:
                ethg[1];
        }

        Switch1: TsnSwitch {
            gates:
                ethg[2];
        }

        Node2: TsnDevice {
            gates:
                ethg[1];
        }

    connections:
        Switch1.ethg[0] <--> EthernetLink {  datarate = 1Gbps; } <--> Node1.ethg[0];
        Switch1.ethg[1] <--> EthernetLink {  datarate = 1Gbps; } <--> Node2.ethg[0];
}

ini file:

[General]
network = netmask_bug

**.crcMode = "computed"
**.fcsMode = "computed"
**.numPcapRecorders = 1
**.receivingSignalNames = ""

# all Ethernet interfaces have 1 Gbps speed
*.*.eth[*].bitrate = 1Gbps

# Using inline XML configuration for IP-addresses
*.configurator.config = xml("<config> \
                                <interface hosts='Node1' names='eth0' address='192.168.1.31' netmask='255.255.255.x'/> \
                                <interface hosts='Node2' names='eth0' address='192.168.1.26' netmask='255.255.255.x'/> \
                             </config>")
#*.configurator.config = xml("<config> \
#                                <interface hosts='Node1' names='eth0' address='192.168.1.31' netmask='/24'/> \
#                                <interface hosts='Node2' names='eth0' address='192.168.1.26' netmask='/24'/> \
#                             </config>")

*.Node1.numApps = 1

*.Node1.app[0].typename = "UdpSinkApp"
*.Node1.app[0].display-name = "Node1 endpoint"
*.Node1.app[0].io.localPort = 4101

*.Node2.numApps = 1
*.Node2.app[0].typename = "UdpSourceApp"
*.Node2.app[0].display-name = "Node2_Node1_Stream"
*.Node2.app[0].io.destAddress = "Node1"
*.Node2.app[0].io.destPort = 4101
*.Node2.app[0].io.localPort = 1101
*.Node2.app[0].source.packetLength = 238B - 54B
*.Node2.app[0].source.productionInterval = 1833.333us