esp32C6 , GPIO0 battery level reading lower than expected now... why?

I have been using since many months the GPIO0 to read the battery values of the lipo connected to my Firebeetle 2 esp32c6 (mini and not, SKU : DFR1075 rev 1.0 & SKU : DFR1117 rev. 1.1); everything worked well but now, recompiling the sketchs in Arduino IDE with the latest updates I start sistematically to see a much lower reading ( i.e. raw of  1505  instead of the previous 2040 when charging @about 4.1V). Has something changed in the core or in the recent libraries that has a nug in the reading…????

The same device, programmed in ESPHOME , reads correctly on GPIO0 the 4,1V …..

Does it happen only to me..?

Thanks a lot.

F