Well, as it turns out, there was a need for an upgrade of the driver. This was even mentioned in the documentation but I did not fully understand it:
Firmware versions higher than 6.4.0.0 may be required to work with some newer devices (i.e. those conforming to the Zigbee 3.0 standard). If your dongle has older firmware then devices may appear to join the network, but will not work as they will leave the network if they do not receive updated security information.
Using the zigbee firmware VERSION command, I found out that the preprogrammed version was quite old (5.6) and using the binary indicated in the other topic, I was able to upgrade it to 6.8 which now allows the stick to fully recognize the sensor.
The only issue is that I had to create the bridge thing manually because of an issue with discovery that is being currently discussed
With all this, the values are now updating properly.