Here is a list of bugs i've seen in 1.19:

1. The scroll map (the one you get when zoomed out) often is missing treasures and quests that are shown on the regular map.  If you save and load it often fixes this.

2. Getting the AI to give you gold to declare war on another AI is extremely OP at the beginning of the game.  You can often get somewhere between 300 - 500 gold which is most of their gold even at higher difficulty levels.

3. You can use enchant weapon +5 damage multiple times on the same hero.  This makes it so you can get like +50 damage on a champion which is just ridiculous early in the game since you can pretty much one hit anything.  I'm not sure if this is true for all enchantments or just enchant weapon.

I played one game with opponents at extreme difficulty and by combining 2 and 3 i was able to wipe out the AIs easily even though they do seem much better at defending their cities.  I got to claymore and used enchant weapon like 8 times and had 100 damage on my sovereign while the highest attack I saw them have was around 25.