api: `democracy.delegations.entries()` doesn't work at kusama height 295787

Network: kusama. Tried api version: 8.0.2, 8.1.2

My code to test:

const { getApi } = require("../api");
const { encodeAddress } = require("@polkadot/util-crypto");

;(async () => {
  const api = await getApi();
  const height = 295787;
  const blockHash = await api.rpc.chain.getBlockHash(height);
  const blockApi = await api.at(blockHash);

  const delegations = await blockApi.query.democracy.delegations.entries(); // the code which produce error
  console.log(delegations);
})()

The error produced:

Error: Unable to decode storage democracy.delegations: entry 0:: createType((AccountId,Conviction)):: (AccountId,Conviction):: Decoded input doesn’t match input, received 0xca5bc1915da74aba3aadd7ce7b809045d5eb5b73559259755fdcd85a40a5dc6e060000 (35 bytes), created 0xca5bc1915da74aba3aadd7ce7b809045d5eb5b73559259755fdcd85a40a5dc6e06 (33 bytes)

Same bug also happens at heights 433879, 452692, 504000, 504329, etc. What I’m trying to do is calculating the tally for kusama historical referendums while you know there is no direct storage for these data.