Cannot create Offshore Wind Farm or Seastead after researching appropriate tech

[refola]

I've played thru a game of Unciv with your mod and waited until the end to finally research the techs for improving Shallow Water and Strong Winds tiles, but the Work Boats didn't have the option to improve the resources. I suspect this is due to an upstream change due to the following paragraph.

I remember Unciv previously requiring separate techs for discovering Oil and building offshore oil platforms, but things seem to have changed. I just tested it and simply researching Biology was enough to build an "Oil well" on the Coast. Thus I conclude that Unciv must have changed in a way that broke requiring different techs to see vs improve water tiles.

Other info

Unciv version: 3.9.13 (desktop, my own packaging of the official Unciv.jar from the GitHub releases page) Mod version: 1.5, fresh from this repository just two days ago.

[refola]

I may have been mistaken about offshore platforms having ever been supported in Unciv as distinct from oil wells. Here's what I've found so far by digging thru the history of techs.json:

• The latest version has a comment in the Refrigeration tech saying "todo: offshore platform should need this".
• The commit which added that comment shows that it previously had a description of "Does nothing since we have no sea tiles - In theory, allows construction of offshore platforms and submarines".
• Even earlier commits to that part of techs.json are 3 years old (late 2017).

Related Unciv bugs:

• "Work boats should create offshore platforms on oil" (2018 Nov) closed with neither comment nor commit reference. I think it was just abandoned.
• "Missing features of Tech Tree" (2020 Mar) calls for (among several other changes) moving Offshore Platform (water tile version of Oil Well) from Biology to Refrigeration tech. This was closed due to having a lot of G&K content, which is beyond the scope of Unciv's current development target.
• "Misplaced features in the tech tree" (2020 Apr) again calls for the Offshore Platform change and tons of non-G&K-specific changes. This one was closed due to it being a hassle to implement before Unciv supports distinct "version" options for, e.g., vanilla vs G&K vs BNW.
• "Missing features from Vanilla Civ V" (2019 Apr; comment is just now) covers game mechanics which are in vanilla Civ V. I suspect that the "different techs to see vs improve a resource" mechanic used by oil is what this mod needs to fix Offshore Wind Farms and Seasteads. I added a comment asking for Offshore Platforms.

So I really don't know if it was ever possible to have sea resources visible before they can be improved and have the improving tech be other than just Sailing. I have no idea what the best fix for this mod is, but changing to "improvement": "Fishing Boats", at least makes the improvements possible (albeit seven eras sooner than they should be).