1. When a "Brothers Sparus" and an "Unfalling Legion" unit atack one another (doesn't matter who is attacker), there is an infinite attack animation loop and the only way to escape is to do autobattle. (Have a save, but couldnt' figure out how to upload it  )
2. When you select a unit (one left-click) on the world map and see his stats in the bottom left corner of the screen, those stats do not update after casting an enchantment like "Burning Blade" until you select the unit a game.
3. When you view the spellbook and select the Tactical tab. You know how spells are divided into different categories like Summon and Unit Enchantments? Well the category for slow is "String not found". Just start a new game as Procipinee and check her spellbook.
4. Start a new game. Move the sovereign to a far destination (i.e. more then his max # of moves. Click End turn. Save game. Load game. After loading the game, you'll notice that the Sovereign automatically moved again. Could be undesirable.
5. At least for the Pier improvement, the people fishing from it may not necessarily have their fishing poles in the river.
6. For cities built near a river , the fence may look weird in some tiles (across a river, or along the river's coast).

Other bugs you probably already know about:

1. Units with poison damage, if they attack and the victim dodges, the poison damage is still done.
2. Some tile yields on the world map sometimes are there one turn, disappear on another turn, and reappear on another.
3. At the start of a quest, when it asks if you'd like to attempt the quest, if I select no, the quest is destroyed and no longer appears on the map. Instead, it should leave the quests there on the tile, awaiting another champion to attempt it.
4. "Air Shrills" that cast static blast in tactical battle: sometimes, the spell effect animates over one unit, but the damage is done to a different unit. (let's say like a 40% chance).