Pulau Ubin (http://www.openstreetmap.org/#map=14/1.4089/103.9589) seems to be leaking. I’ve taken a look at it in the coastline inspector and in JOSM, but I’m not familiar enough with coastlines to know what the problem is. Anyone have any ideas?
That was my first thought, but the last edit was about two weeks ago - it doesn’t normally take that long, does it? At the bottom of your link it says coastlines are updated daily.
I think daily attempts are made, but that does not mean that they are updated on a daily basis. If the coastline is broken, no updates are done that day and another attempt is made the day after.