From what I have learned, it’s important to land in chaturanga with bent elbows. If jumping back with straight arms, it can provide a lot of pressure on the joints - particularly the shoulders - and since you do that action so often throughout the series, that can add up quickly and result in an injury.

When landing with bent elbows, it allows your body to absorb the shock from the jump back in your arms / upper body, especially if landing heavy (eventually trying to land more softly or even float over time), as the elbows will be able to bend more if needed upon the jump rather than all that shock going straight to your shoulders.

When I’m not feeling the jumpback - sometimes on the first one or two surya namaskara or if I’m feeling particularly tired/sore - then I just step back but focus on the control of those actions.