Aqara E1 TRV local_temperature issue

Hi! I recentrly bought a Aqara E1 TRV and now figuring out how this works.
I connected it by use of zigbee2mqtt which works great.
I wonder if it is normal that the local temperature (the meassured room temp) is reported only in 1 degree steps: I get 19.2, 20.2 or 21.2, but no values in between. Or is this due to a certain setting?
Hope someone can help!

I have the E1 connect through ZHA with a conbee stick. The temperature is now stuck at 18.9 degrees for a week. It is possible the room has not changed for more than 1 degree, this could be an explanation.