I recall that the synchronous landing was unintentional, they are supposed to be staged a few seconds apart for tracking purposes. Also the live feed for the f

I recall that the synchronous landing was unintentional, they are supposed to be staged a few seconds apart for tracking purposes. Also the live feed for the first launched accidentally used the same camera feed from one booster on two windows, instead of the second booster on the second window. This was corrected in the archived video (what you see currently on YouTube for the first launch isn't exactly what was shown live). So that made it look like (from the on board camera perspective) that both landed at exactly the same time.