Try multiple beaches. One can be sanded "in", while another, just a mile away, can be eroded down to bedrock. And even if you see the effect where sloppy soft sand seems to have been pulled down from the dunes onto the inter-tidal zone, then : In such situations you "check back ~2 days later". Because sometimes mother nature, in the days that follow will subsequently take sand off the inter-tidal zone to "fill in" off-shore voids that had been created. Or sand moves left to right to fill in low spots. Each days' subsequent tides can continue the action, as mother robs sand in one area, to fill in lows, and re-adjust her angles of slope.