Well,the biggest concern when repotting autoflowers is shocking the roots,which consequently stunts the plant's growth for up to 7 days or more which is significant, because most autoflowers live only between 60-90 days,and as you wrote bottom ones came off or are damaged is not good at all ,autoflowers should be planted in final pot from seed ,even if she survive and will continue to grow again your harvest might be decreases.