`None` in the `QueueConfig` storage item of `XcmpQueue`

[tadeohepperle]

When using the Polkadot Explorer with wss://polkadot-asset-hub-rpc.polkadot.io
navigating to https://paritytech.github.io/subxt-explorer/#/pallets/XcmpQueue/storage_entries#QueueConfig
shows None for the QueueConfig storage item while polkadot Js can retrieve it: https://cloudflare-ipfs.com/ipns/dotapps.io/?rpc=wss%3A%2F%2Fpolkadot-asset-hub-rpc.polkadot.io#/chainstate