We encountered a problem when sending data using multicast

[Z-J-X]

What happened?

We encountered a problem when sending data using multicast：
In the case of multiple gateways, multicast data is sent using the gateway that the device in the packet last communicated with. For some reason, I deleted this gateway in the application server. The gateway record that the device recently communicated with is still the deleted gateway. At this time, I will report an error when sending multicast data.

What did you expect?

In this case, multicast data distribution should ignore this error and adopt the warning method, because there will be multiple devices in the group, and the gateways used by the devices may not be the same. Deleting a gateway should not cause other gateways in the group to be unable to distribute data.