Hope the map work goes well but glad to see you back on the drudgery work (sorryyyyy). First a few housekeeping items:
- In City View for non-core cities, the tool-tip for all Unique Buildings that reduce maintenance, not just those that replace Jail and Courthouse, list "Reduces expansion stability penalty" as an effect.
- Complete List of Features contains outdated Citadel entry (+5 XP for Siege)
Otherwise, some observations that aren't necessarily bugs per se:
- AI Mongols only have Paper as a research priority so they beeline Exploration and favor other eco techs over military
- Mongol Expansion seems to be in conflict with scripted conquerors in that they now rarely attack China. Starting army exhibits strange behavior like hovering around capital.
- Some wars seem to last insanely long. In particular Spain vs. Moors. After Cordoba is conquered, the war reaches a stalemate as Moors prioritize ships. I only present this as an issue because it has often caused Spain to sit out the Reformation war, which to me is kinda cursed.
- HRE is only European civ to research Academia. This has been true in 100% of the over 50 games I've played recently.
- France won't settle Brest if England settles Plymouth or Exeter and vice/versa, even if a settler was already on the war. ALT+hover in debug mode shows the yellow settler X disappearing if that helps.
- AI sometimes sacks Expansion cities.
- I need to verify further, but I suspect AI is still pillaging independent improvements. I mention this because I recall a Git log entry stating that this is no longer supposed to happen.
- Some strange things happen with culture on what seems to be only a few particular tiles. IIRC these include Odessa, Belgrade (or Budapest), and Luxor. City culture will fluctuate between ludicrous positive and negative values. I'm currently trying to replicate and verify.
The above info was reported with a "take this and do what you want with it" attitude. I'll always defer to the boss on design decisions. No doubt several "issues" will resolve organically with new map and systems that you're rebuilding.