When shards are refreshing the balancer configuration from the CSRS (every 30 seconds), some reads are performed on `config.settings` to retrieve the current state of the balancer.

It is then possible that a shards temporarily has a non-updated status of the balancer for 30 seconds. For example, it can happen that a shard believes the auto splitter had been disabled because a refresh can see the stop of the balancer and not the subsequent start.