It doesn't look too bad to me. The beach doesn't necessarily have to follow the coastline. I think this - https://overpass-api.de/achavi/?changeset=131728273 - is the relevant change to your suggestion. Before, the coastline was inland of the beach edge, now it's the other side. The "OS OpenMap Local (April 2023)" layer does show mean high water (and therefore the coastline) here as currently mapped. (NB. The mean high water line has changed on OS maps since the original import)