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In 2.1, all scripts work correctly.
The additional quest is easy to complete. Just remember to save before approaching the peasants you need to rescue. Then, even if Laslo interferes, you can get lost. It should be noted that you need to eliminate the undead in the center of the map as soon as possible (the landscape will help you; place archers and ranged units behind stones and cover them with zealots; when they are killed, move swordsmen to the front for cover), because the archers behind them will join you, and there are about 70 of them, which greatly simplifies the gameplay. There is also a Fortress there, which will allow you to upgrade your creatures. In the lower right corner of the map, you can kill the archers, and Battle Griffons will join you. But this is not as critical as playing without archers.
Get rid of all the left-wing troops, such as peasants, with Laslo. You don't need them. All battles in this scenario are fought only with archers. Protect them with all the others. Don't forget to cast Haste on the hero first, and then Bless on the archers, which will greatly increase their effectiveness.