Bluetooth Visualization Map - Entity Colour

I’ve set up two ESP32 Bluetooth Proxies to connect with three Melnor sprinkler controllers. The proxies and all connected devices are communicating and functioning perfectly.

However, I'm noticing a discrepancy in the Bluetooth Visualization tool: the color coding for each of these successfully connected devices displays as 'unknown' rather than 'known.' Does anyone know why this visual glitch occurs? I’ve attached a screenshot for reference.