Another brain challenger for our Mahjong Community! Scroll all the way down to the bottom for answers! 
Clarification November 2024
By phone call to the League, they confirmed a clarification: If a player claims the actual tile discarded and then incorrectly adds a different tile or extra tiles to the exposure, they can add or subtract from this current exposure until they discard or initiate a Joker Exchange. We will update when we have a letter in writing confirming and/or if it is in the next annual bulletin from the League.