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It never worked properly in full mode. Now, the save game failed again, repeating itself around the 4th time, but I made the first incorrect move. Then I exited the game and re-entered – the first time it was different, but then it repeated again, just like yesterday.
In general, here's how the repetition starts:
1. With the first move, the gargoyles attack the sprites, positioning themselves opposite the elves. The wall removes 39 hit points from the griffins, and the elves attack and kill the gargoyles. The griffins fly to the castle and position themselves next to the gargoyles. The dwarves kill 2 gargoyles.
2. The wall is broken through. With the gargoyles, we position ourselves opposite the dwarves and attack, killing 2 more gargoyles. The griffins attack the dwarves, the wall kills 2 griffins, and the dwarves attack the griffins, killing one more. There are 4 dwarves remaining.
3. With the gargoyles, we attack the dwarves, leaving 1, and it kills a gargoyle. Then, with the griffins, we kill the dwarf. The losses are huge: 5 gargoyles and 4 griffins. The hero levels up, and the game ends.