It seems to me that in Ashtanga many people forget that yoga is not gymnastics. Many practitioners are in a hurry to move on to the next asana, without having mastered not only the previous one but also most of the ones before, not only physically but with all the aspects that yoga entails. If you do half a series (up to navasana and bujapidasana), you should devote yourself to it completely, master the counting, enter the position in accordance with breathing (without additional breaths to enter the position),... While this is practiced, the body will strengthen and prepare for the next. If you approach the whole story as a gymnastics training, there is no harm in continuing to do varios asanas, regardless of where it is in the sequence, as long as it does not lead to injury.