@abatapa Thank you so much for your support with MyController.
If the GW, which had first registered the switch - is now fully responsible for the switch. And if the GW is down - i can't do nothing with the switch binded to him. I need to go to find the same switch on "other gateway's" and only then - switch the switch
Looks like you are using same radio channel on both the gateway. MyController does not know anything about behind gateway. MyController adding resource details as received from your gateway. Here, your gateway duplicating sensors.
AFAIK, you should have only one gateway in MySensors network. When we have more than one gateway, we might face issues like this.
We may go with MQTT in this case. But this will duplicate all of your data. Example: When you turn on the switch, your node will receive two times. Similarly, when the node sends data to the gateway, MyController receives two times. If you have enabled OTA firmware update for this node might face a serious issue in this case. I never worked with two gateways on same radio frequency. Kindly check with MySensors community. They might have strong experience on this.