Entity ID changing on restart

Hei Guys, I got some ( for me weird behaviour).
I integrated some sonoff sensores with tasmota firmware and MQtt Connection.
I’m using the MQTT Plugin with Mosquitto Broker
The Sensor was recognized automatically and entities were created too.

I renamed one entity to

sensor.tasmota_9_ds18b20_temperature

If if I unplugg the sensor and plug it in again. the entity is renamed to

sensor.tasmota9_ds18b20_temperature

automatically.

Is this behaviour standard or am I doing something wrong?
Hope anybody can help me out with this as I am not so familliar with HA.

Regards Manuel