I guess so far if I leave a map early on my gunwitch it seems to happen? It has only happened twice so far though.
Expected Results: Items to be returnedOne of my friend's accounts consistently has a similar problem with items disappearing. Relogging fixes it 90% of the time, but sometimes after completing a map and returning to tavern then turning the xbox off, we'll discover that all items earned from the last match are not there and relogging does not help. So items are definitely still disappearing. She filed a support ticket a week ago but no response...
Just found that closing out the game and restarting it returns all of the lost items, sorry!