Eltek WebPower missing battery temperature after update

Hi!

We updated our Observium around August 2019 to newest Revision and after that update we haven't received any "Battery Temperatures Alarms". 

After investigating the issue, I believe the reason is that the sensor itself is missing in Observium for the Hardware "Eltek WebPower" with operating system Eltek 2.5.2

Here's a picture about the "Sensors" view for our Eltek-device, as we can see theres no BatteryTemperature sensor anymore:

Here we can see an email alarm from the same device for the battery temperature as a proof it definitely worked before the update:

Any ideas how to fix this? Or can we assume this to be fixed in the further Professional revisions?