Unfortunately, the return of in-game items or compensation is not possible, regardless of the reason for the loss, for technical reasons.
Please note that the project is under development and any situations may arise that may lead to the loss of ingame items.
You can report to the support department all the circumstances of the loss of items, if it was caused by a bug or malfunction of the game, in order to further correct the problem.
Thank you for your understanding, good luck with your raids!