DJI OSD Cell voltage confusing number of cells with Li-ions

Noticed a bug in Arduplane. When cell detection is set to auto and Li-ion pack drops below certain voltage my DJI osd starts thinking that I swapped midflight my pack to a one with lower cell count.

14.5V - all is fine, OSD shows 3.6V per cell.
13.1V - OSD shows 3.2V
13.0 and below - OSD shows 4.2V per cell.
SRT files also show switching from UAV batt cell count 4 to 3.

Pretty annoying. Doesn’t happen on INAV as far as I know.