Well i got ctd by doing this too
I did 6 untis of Tomoe gozen (not a general)
and 6 units of Musashi (not a general
and same with Mongol, Choson, Yuwan and Zhuanshi

everything was fine at first


then i zoom in to Tomoe and musashi then i got ctd

I think this will happen to any ancestors but not sure DX


Lowest Detail
Normal Unit Size