My comments on the mod checker output

[SomeTroglodyte]

Small problems:

• Four deprecations - just do what they say (and I have no idea why <upon discovering [Military Science]> was replaced by <upon discovering [Military Science] technology>)
• The Coffee Axis building has uniques whose actual effect are on the tile improvement. Use the Comment UniqueType:

  "uniques": [
          "Creates a [Coffee Hacienda] improvement on a specific tile",
      "Comment [+1 Coffee from Coffee Hacienda]",
      "[+1 Production, +1 Culture, +1 Gold] from [Coffee Hacienda] tiles [in this city]",
      "Comment [The Hacienda cannot be built on Desert, Tundra nor Snow, only on Grassland/Plains Hills]",
      "Limited to [4] per Civilization",
          "Destroyed when the city is captured",
          "Unsellable"
      ],

• If you're really happy with the Nation colors, just add "Suppress warning [*colors do not contrast enough*]" to the modOptions uniques.

Medium problems:

• Darien Gap as tile improvement can't do damage or extra movement. No field or unique allows this. And IMHO - it is a terrain feature by character and story, and Unciv Terrain(type=Feature) can do both.

• Cuba's "Receive a free Social Policy each time you complete a Factory, Public School or Hospital in the capital" is done as 3 hidden Buildings - Trade unions, Free education, Free healthcare, right? Well, I can't imagine that works cleanly. Extra turn, depends on user having autoselect construction on,...? Haven't tested. But why not as Nation Unique (instead of those Buildings)?

      "uniques": [
          "Comment [Receive a free Social Policy each time you complete a Factory, Public School or Hospital in the capital]",
          "Free Social Policy <upon constructing [Factory] [in capital]> <hidden from users>",
          "Free Social Policy <upon constructing [Public School] [in capital]> <hidden from users>",
          "Free Social Policy <upon constructing [Hospital] [in capital]> <hidden from users>",
      ],

[RealBamboolord]

* Cuba's "Receive a free Social Policy each time you complete a Factory, Public School or Hospital in the capital" is done as 3 hidden Buildings - Trade unions, Free education, Free healthcare, right? Well, I can't imagine that works cleanly. Extra turn, depends on user having autoselect construction on,...? Haven't tested. But why not as Nation Unique (instead of those Buildings)?

        "uniques": [
            "Comment [Receive a free Social Policy each time you complete a Factory, Public School or Hospital in the capital]",
            "Free Social Policy <upon constructing [Factory] [in capital]> <hidden from users>",
            "Free Social Policy <upon constructing [Public School] [in capital]> <hidden from users>",
            "Free Social Policy <upon constructing [Hospital] [in capital]> <hidden from users>",
        ],

This is to prevent exploits done by selling Factories and building them again Iirc