(Steam PC)Black Cerberus arms armor piece can't be aquired

The problem is as follows:
I have defeated Black Cerberus boss using tactics for weapon 2.0, so i should get fulla armor and weapon. Checked inventory, there is everyting besides arms. Later on i have cut the arm of BC unit guarding entrance to Nucleus. I got the animation for getting the blueprint, but when i checked invetory, it wasn't there.

my save file

I have exactly the same problem but in a ps4. The other not boss Black Cerberus enemies dont show the square option to cut off arms.