I stumbled upon an island not rendering properly. I have made several attempts to correct this by trying something a little different with each of the three islands that don’t seem to appear on the map.
If anyone could take a look and let me know what is wrong it surely would be appreciated.
I have made some corrections for JOSM detected errors. E.g., there were a number of overlapping / duplicated ways. Please note that the updating of coastlines is a slow process, and it may actually take up to a month before you can see the changes (based on some other very similar issue regarding coastline and island I solved quite some time ago).