Bus module with multiple Temperature sensors

[HSZ]

It seems that both temperatures are written to one variable.

That ist correct. The Bus-Module can not recognize different LCN-TS. All LCN-TS send the same Data.

Is such connection is even supported?

No, only one LCN-TS is supported by one Modul

I know for lcn-bmi there are addresses

That is right. And the LCN-GRT can also different adresses for the Temperaure Sensor. So you can use up to four LCN-GRT with one Bus-Module