Thank you for playing "Fate/Grand Order".
The following is a message from the administrative team.

We have discovered an issue within the Limited Time Event “Revival: Servant Summer Camp! Chaldea's Thriller Night - Lite” where users who did not obtain Mash Kyrielight's Spirit Dress "Swimsuit of Everlasting Summer Ver. 02" in the original event and purchased the Spiritron Dress by exchanging Rare Prisms are not returned the initially exchanged Rare Prisms after clearing the corresponding Main Quest.

We are currently investigating the exact cause of the issue.
We plan to compensate all users affected by the issue from 2023-06-06 21:00 PDT.
We will share more details as soon as we can.

We sincerely apologize for the inconvenience to all users.