At 0.5X my dad shows BSD as well
Target: Pascal_scaled
Distance: 4.7457% / 0.04745673 | ADC: 0.5x RC
45.2 YAMNAYA
34.0 EEF
20.8 BSD
On a PCA, BSD is quite close to Yamnaya. So there should be an explanation that at higher ADC, it starts to be chosen instead of yamnaya.
I'll let expert give a better answer than mine.

