Question: What happens when the game begins and East picks a tile from the wall prior to discarding and now has 15 tiles in their rack?

Answer: 

• If East hasn’t yet discarded the mistakenly picked tile from the wall, they may return it and then proceed to discard.
• On the contrary, if East picks an erroneous tile from the wall and discards it, their hand should be declared dead as a result of having too many tiles in their hand.

Source: Letter from the League dated July 12, 2023