My guild killed 10 man normal Ragnaros tonight. Our mage that is also on the quest was delayed in passing on the Seething Cinders. The chest despawned when the rest of the loot went out and the cinders seemingly disappeared with it even though they were still being rolled for. I’m sitting at 894 cinders and 111 dropped from the chest (33+78). Now our guild is delayed by 2 more bosses and what might be 25+ cinders total on our staff progress and will have to interrupt raid to do the RP quests next week.
this same thing happened to me and my group lastnight, opened a ticket and they didnt do anything but send me here. hope you got your cinders