Emulated Kasa Home Assistant Issue?

It is the MAC address, not the name, that Sense uses to identify a Kasa device. The MAC address for an Emulated Kasa device is derived from the unique device ID in Home Assistant. If the Home Assistant device ID changes, the MAC address changes, and Sense sees a new unique device. No way around that.

I also found an issue filed with Emulated Kasa that discusses the very circumstance you are in:

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