`api.query.proxy.proxies` on some blocks doesn't work

[wliyongfeng]

• I'm submitting a ...

• [x] Bug report
• [ ] Feature request
• [ ] Support request
• [ ] Other

• What is the current behavior and expected behavior?

On block 11178419, proxy.proxies doesn't work. Please use following code to reproduce:

async function queryProxies(api, delegator, height) {
  const blockHash = await api.rpc.chain.getBlockHash(height);
  const blockApi = await api.at(blockHash);
  const proxies = await blockApi.query.proxy.proxies(delegator);

  console.log(proxies.toJSON());
}

(async () => {
  const api = await getApi(); // please construct an api by yourself
  const delegator = "1KvKReVmUiTc2LW2a4qyHsaJJ9eE9LRsywZkMk5hyBeyHgw";

  await queryProxies(api, delegator, 11178419);

  process.exit(0)
})();

• What is the motivation for changing the behavior?

• Please tell us about your environment:

• Version: 12.3.1

• Environment:

  • [x] Node.js
  • [ ] Browser
  • [ ] Other (limited support for other environments)

• Language:

  • [x] JavaScript
  • [ ] TypeScript (include tsc --version)
  • [ ] Other

[TarikGul]

rel: https://github.com/polkadot-js/api/issues/5974

Might just need the corrects types set in types-known.