When I enter ship mode close to the island for Flarais de Flu there isen't any visible island, just water.
Tried approach it from different places but dosen't seem to matter.

Have uploaded a save where this bug can be found:
https://drive.google.com/open?id=1v3v7-JhKHV_bjciU2gHv2bSAPG6Gz6dc

I just updated it again.  My worldmap workaround requires that the worlmap.island and the island.id match and that one did not match.  I've corrected it and Falaise De Fleur works now.

Awesome! Thank you sooo much man! Works great!
Really appreciate it! Having so much fun!!