WTH did I loose the energy data when I changed my "energy reader"

I have a french smart energy meter with an output that provides the data also available on the meter’s screen.

I had one Zigbee device inserted in there that I used to get the meter data and get that in the Energy overview. But it was unreliable and I changed to another vendor also transmitting through zigbee.

When I changed I lost the previous values from in the Energy panel. There may be a way to keep them or get them back, but WTH is that not automatic?

It is, you just need to keep it the same entity_id…