I use dvorak as my primary layout and hadn't observed any ghosting, but I can reproduce your CSMSDC case! Interestingly, I tried it on my modded keyboard and i

I use dvorak as my primary layout and hadn't observed any ghosting, but I can reproduce your CSMSDC case! Interestingly, I tried it on my modded keyboard and it works properly. :) QMK must correctly handle the lack of NKRO diodes on the matrix.