Players A and B pass. A clicks “Accept”, but B notices an unfinished region and resumes the game. Game is resumed, moves are played, then A and B pass again. A’s “Accept” button is already in the clicked state; A cannot click it again. Meanwhile in B’s interface, it appears that A has not clicked the “Accept” button.
Seen this twice in the last 2 weeks. Firefox 140.8.0esr on Linux.