Ни чего не бывает таким постоянным как временное.

«По причине глобального дефицита серебра и рекордного наплыва заказов он отменяет ранее запланированные даты по размещению и отгрузке заказов на серебряные монетки.  Новые даты будут сообщены позднее (= неопределены)».

Полный текст пресс-​релиза (на английском):
The United States Mint is committed to providing the best possible online experience to its customers.The global silver shortage has driven demand for many of our bullion and numismatic products to record heights. This level of demand is felt most acutely by the Mint during the initial product release of numismatic items. Most recently in the pre-​order window for 2021 Morgan Dollar with Carson City privy mark (21XC) and New Orleans privy mark (21XD),the extraordinary volume of web traffic caused significant numbers of Mint customers to experience website anomalies that resulted in their inability to complete transactions.

In the interest of properly rectifying the situation, the Mint is postponing the pre-​order windows for the remaining 2021 Morgan and Peace silver dollars that were originally scheduled for June 1 (Morgan Dollars struck at Denver (21XG) and San Francisco (21XF)) and June 7 (Morgan Dollar struck at Philadelphia (21XE) and the Peace Dollar (21XH)). While inconvenient to many, this deliberate delay will give the Mint the time necessary to obtain web traffic management tools to enhance the user experience. As the demand for silver remains greater than the supply, the reality is such that not everyone will be able to purchase a coin. However, we are confident that during the postponement, we will be able to greatly improve on our ability to deliver the utmost positive U.S. Mint experience that our customers deserve.We will announce revised pre-​order launch dates as soon as possible.