Using getLogs with getDefaultProvider raises Error: unsupported method: getLogs

[fcanela]

When using a default provider (never when configuring it using new ethers.providers.JsonRpcProvider) I frequently get an Error: unsupported method: getLogs. During a few executions it can return the expected result and then suddenly start failing with that message.

import { ethers } from 'ethers';

const CONTRACT_ADDRESS = 'xxxx';

const provider = ethers.getDefaultProvider('goerli', {
  infura: 'xxxx',
});

const reproduce = async () => {
  const toBlock = await provider.getBlockNumber();
  const fromBlock = toBlock - 20;

  const logs = await provider.getLogs({
    address: CONTRACT_ADDRESS,
    fromBlock,
    toBlock,
  });
  console.log(logs);
};

reproduce();

/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/utils/errors.ts:694
            error = new Error(message);
                    ^
Error: unsupported method: getLogs (operation="getLogs", info={ "filter": { "address": "0xxxxx", "fromBlock": "0xxxxx", "toBlock": "0xxxxx" }, "method": "getLogs" }, code=UNSUPPORTED_OPERATION, version=6.9.0)
    at makeError (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/utils/errors.ts:694:21)
    at assert (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/utils/errors.ts:715:25)
    at EtherscanProvider._perform (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/abstract-provider.ts:687:15)
    at EtherscanProvider._perform (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/provider-etherscan.ts:609:22)
    at EtherscanProvider.#perform (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/abstract-provider.ts:560:28)
    at EtherscanProvider.getLogs (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/abstract-provider.ts:1166:34)
    at FallbackProvider._translatePerform (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/provider-fallback.ts:464:39)
    at /home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/provider-fallback.ts:519:43
    at FallbackProvider.#addRunner (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/provider-fallback.ts:532:11)
    at FallbackProvider._perform (/home/xxxx/src/xxxx/goerli-ping-read/node_modules/ethers/src.ts/providers/provider-fallback.ts:767:43) {
  code: 'UNSUPPORTED_OPERATION',
  operation: 'getLogs',
  info: {
    method: 'getLogs',
    filter: {
      address: '0xxxxx',
      fromBlock: '0xxxxx',
      toBlock: '0xxxxx'
    }
  },
  shortMessage: 'unsupported method: getLogs'
}

Ethers Version: 6.9.0. Reproduced in a dockerized environment.

[fcanela]

As always, sharing the issue just helps to pay attention to things that were slipping. All the times it failed, it was the etherscan provider the one at fault. If I pass - as etherscan API key to disable it, things work. I have tried to provide an etherscan API and it still fails.

This is a pity because I want to use etherscan too as one of my providers. Any clue of what may be happening?