If one duels an opponent in Quests and leaves under any circumstance, coming back to the same quest will always pick back up where they left off.
This can cause problems if an attack caused the game to crash, as the game will resume exactly before the opponent made the attack.
Additional details: Can be resolved by clearing the app cache through device settings.
Seemingly caused by the game saving the duel state, as it never properly ends.
If one duels an opponent in Quests and leaves under any circumstance, coming back to the same quest will always pick back up where they left off. This can cause problems if an attack caused the game to crash, as the game will resume exactly before the opponent made the attack.