Getting tag data/presence over MQTT from gateway with no anchors around

I have a Raspberry 3b mounted gateway and a tag which is in range of this gateway. The behaviour I have observed is that : if there are no anchors in range of the tag, Gateway and the web application is unable to detect the tag as well. I understand there will be no positioning happening but I am unable to get the presence of the tag as well.

Is this the regular behaviour of the system or there is a mistake in my implementation.

Hi can anyone please help me with this. Thanks!