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After the simultaneous turns were interrupted, the blue player lost the ability to use the spellbook on the adventure map.
The sequence of events leading to this error is as follows:
I am playing as blue against the player nuke007, with the turn order set to 127.
I either make my turn 121, or I have already completed it and passed the turn.
A message appears indicating that simultaneous turns are being interrupted because the red player's heroes are directly adjacent to mine.
Because I had some window open, the entire interface to the right of the map is covered in black (this effect occurs frequently). Clicking the mouse on the interface restores the normal interface.
However, the button to open the spellbook on the interface is inactive. Switching between heroes (some of whom have a spellbook) does not help. Starting a battle does not help; the spellbook works in the battle.
The opponent refused to upload the save, so I had to exit the game. A screenshot is attached.