Pedro Martínez:
As I understand it, a player may inadvertently make an illegal move due to the bug that would otherwise be impossible. More critically, in certain positions with few remaining movable pieces, a player may be forced to make the illegal move which would otherwise be prevented without the bug.
In either case, a player may have a legitimate argument that the illegal move was unintentional. With the list, voluntary resignation is agreed upon without involving a moderator or management and no move reversal is necessary.

Have such moves been reversed?
How long does it take?
What happens if unidentified pieces become identified as a result of the illegal move?