get_storage returns empty value for valid key

[extraymond]

When using substrate-contracts-node, when try to read the raw storage value using pallet_contracts::rpc::get_storage(addr, key), it always returns None, compared to using my custom runtime, it reflected the results correctly.

I tried two different routes just to be sure:

1. using polkadot.js/apps and query the first layout item for a deployed contract with get_strage
2. using subxt to call rpc directly

Both cases returns incorrect value for substrate-contracts-node.