I've removed the Water Hazards from the waterway to test if these are causing the issue
changeset/157086983

Thanks Nevw, I've looked at it again and changed it back to outer but theres quite a bit going on with the water in this particular section as it is also tagged as a water hazard for the golf course. Attempting to change it to a Coastline caused some issues with this water hazard that I couldn't resolve.

Hi Joel, it's not yet open but is very close to completion and open date. Should be some time this month hopefully!