Hand 543599 of Game 65611: Line 177 shows 5character drawn --- during the actual game, the player was shown a Kong button (& a Cancel button) when the only plausible set of three was a melded 3character Pong --- the drawn tile could not be used to make a kong for the player who drew it.

Incidentally: a bot "won" this hand with 7=6+1 points in a game using an 8-point minimum --- because the Last Tile rule was invoked when Fully Melded was also scored. The official rule book is very explicit that all players must be able to see the other 3 versions of that tile already on the table (among the melds or discards).