Sorry for the late reply. I did not expect any reports in this mod.
The "suppress factorio water" option was not provided by this mod or the "Cargo Ships" mod, so I could not investigate the problem. I think that's probably an option provided by another mod you are using. (Or maybe it's the do not generate water option provided by vanilla?)
Also, since the "Deep Sea oil" resource is not automatically converted to conform to this MOD, the resource is placed in the standard way of the "Cargo Ships" MOD. So, although it is not displayed in the map preview, resources are placed in the actual map.
Sorry for not solving the problem, thank you.