I have died twice in the cities vicinity and every time i die it wont use one of my clones it teleports me back to the airport and doesnt use a clone, not sure if its a bug or a feature so please look into it.
It is intended. Reason being there is a serious flaw with the sync mod in that if you die away from your island and your shell storage/constructor isn't chunkloaded then it won't be triggered and you will simply die (and lose your island), so because we had a lot of people dying in this fashion while in the cities even though they had clones ready on their island, we decided to make it so that deaths in the cities don't count. In order to balance it slightly we also made it so that when you enter the cities via your nether portal it will always send you to a random location making it much harder to get your stuff back if you do die there.