The main bug left that I know about is Villages and Workshops destroying Flood Plains but that will will be quite an extensive fix, affecting numerous files. It would thus require a reinstall and is likely to be incompatible with current saved games (I'll have to check) - may be best to leave it until 1.19.
Disappearing Flood Plains are a serious issue. If they cannot be fixed until 1.19, then I would disallow Flood Plains Cottages and Workshops in 1.18. It's no fun playing against an AI with ruined desert cities. Flood Plains Farms and Quarries would still be available; maybe you could allow Plantations, too. Either way, I think the bug does require some immediate response.
Base Production, and I don't know where they come from. Gold+city tile are 5
per franchise, but their yield is completely offset by corporate maintenance costs, which can run over 10
per franchise can get completely out of hand. Assuming a 10-city empire, we're looking at 50
,
, so I get 34
). Ok, I've got the Temple of Solomon (also in the Stock Exchange city
). I think that's ok.
, 2
. The river commerce is lost to pollution but can be restored by a Highway. There are no techs or civics that can boost them further. This doesn't strike me as being overpowered by that stage of the game, and you're giving up a prime Farm tile.