Jafah

Game connection crashes at [ItemRepository.cs](https://github.com/MeikelLP/quantum-core-x/blob/master/src/Data/Game.Persistence/ItemRepository.cs) at line 73 when the swap is called `await _cacheManager.Set(key, item);` The previous write to the database, line 70, goes through and it is persistent...

The packet handeling was my first guess, but it ended on line 73 and i have almost no experience with memory so i thought its probably wrong. But it still...