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A bug has appeared; it might have been there before, but at least I hadn't noticed it.
The blue player, during the red player's turn, can see the red player visiting objects without defeating the guards (specifically, the library). There are two screenshots showing the time when the red player is standing on the object and the guards are still alive, and when the red player has left the object (teleported), but the guards remain. At the end of the turn, the guards are gone; in theory, I might not have seen who the opponent used to defeat the guards.
It's good that after the opponent's turn, I reviewed the opponent's turn and saw that the guards were defeated by the hero who visited the library. If needed, I can send the screenshots later, after I finish the game.