
In the image, the hero on the left is the attacker, and the hero on the right is the one being attacked. As you can see, in addition to the different terrain, the obstacles on the battlefield are also set differently. The probability of desynchronization is almost 100%. As soon as someone stands on the opponent's invalid battlefield tile, or a unit with a bonus for that surface moves, desynchronization will occur.
I tested this bug in 4 different games, and the result was the same in all of them. It only appears when using the HD mod. I don't know from what time it started. Attached is a save file of the game where Tamika attacks Tunar, and the above-described issue occurs.